增加前端页面展示

.gitignore

@@ -12,3 +12,5 @@ build/
 *.log
 logs/
 tests/
+node_modules/
+web/dist/

README.md

@@ -188,6 +188,23 @@ supply-visualize --open
 
 页面按步骤展示：LLM 输入（messages / tools）、思考过程、模型输出、工具调用的输入与输出。
 
+## 全局分类树（Web）
+
+后端 FastAPI（端口 **8080**）一次性返回 `global_tree_category` 整棵树；前端在仓库根目录 `web/`（Vue 3）。
+
+```bash
+# 后端 API
+.venv/bin/python -m api
+# 或: .venv/bin/supply-api
+
+# 前端（另开终端）
+cd web && npm install && npm run dev
+```
+
+- API: `GET http://127.0.0.1:8080/api/category-tree`
+- 前端: http://127.0.0.1:5173 （开发代理 `/api` → 8080）
+- 默认展开 3 层，可选择展开层数，支持节点手动展开/收起
+
 ## 运行测试
 
 ```bash

api/__init__.py

@@ -0,0 +1 @@
+"""HTTP API for SupplyAgent (category tree viewer, etc.)."""

api/__main__.py

@@ -0,0 +1,5 @@
+"""python -m api"""
+from api.run import main
+
+if __name__ == "__main__":
+    main()

api/app.py

@@ -0,0 +1,34 @@
+"""FastAPI application — category tree API on port 8080."""
+from __future__ import annotations
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from api.services.category_tree import build_category_tree
+
+app = FastAPI(title="SupplyAgent API", version="0.1.0")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[
+        "http://localhost:5173",
+        "http://127.0.0.1:5173",
+        "http://localhost:4173",
+        "http://127.0.0.1:4173",
+    ],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+@app.get("/health")
+def health() -> dict[str, str]:
+    return {"status": "ok"}
+
+
+@app.get("/api/category-tree")
+def category_tree() -> dict:
+    """Return the full nested global_tree_category tree in one response."""
+    nodes = build_category_tree()
+    return {"nodes": nodes}

api/run.py

@@ -0,0 +1,17 @@
+"""Start the SupplyAgent API on port 8080."""
+from __future__ import annotations
+
+import uvicorn
+
+
+def main() -> None:
+    uvicorn.run(
+        "api.app:app",
+        host="0.0.0.0",
+        port=8080,
+        reload=False,
+    )
+
+
+if __name__ == "__main__":
+    main()

api/services/__init__.py

@@ -0,0 +1 @@
+"""API service layer."""

api/services/category_tree.py

@@ -0,0 +1,54 @@
+"""Build nested category tree from global_tree_category."""
+from __future__ import annotations
+
+from typing import Any
+
+from supply_infra.db.models.global_tree_category import GlobalTreeCategory
+from supply_infra.db.repositories.global_tree_category_repo import GlobalTreeCategoryRepository
+from supply_infra.db.session import get_session
+
+
+def _normalize_parent_id(parent_id: int | None) -> int | None:
+    if parent_id is None or parent_id == 0:
+        return None
+    return parent_id
+
+
+def _build_children_map(
+    categories: list[GlobalTreeCategory],
+) -> dict[int | None, list[GlobalTreeCategory]]:
+    children_map: dict[int | None, list[GlobalTreeCategory]] = {}
+    for category in categories:
+        parent_key = _normalize_parent_id(category.parent_id)
+        children_map.setdefault(parent_key, []).append(category)
+
+    for children in children_map.values():
+        children.sort(key=lambda c: (c.level or 0, c.id))
+
+    return children_map
+
+
+def _to_node(
+    category: GlobalTreeCategory,
+    children_map: dict[int | None, list[GlobalTreeCategory]],
+) -> dict[str, Any]:
+    children = [
+        _to_node(child, children_map) for child in children_map.get(category.id, [])
+    ]
+    return {
+        "id": category.id,
+        "name": category.name,
+        "level": category.level,
+        "description": category.description,
+        "children": children,
+    }
+
+
+def build_category_tree() -> list[dict[str, Any]]:
+    """Load all active categories and return nested root nodes."""
+    with get_session() as session:
+        repo = GlobalTreeCategoryRepository(session)
+        categories = repo.list_active_categories()
+        # Build JSON while session is open to avoid DetachedInstanceError.
+        children_map = _build_children_map(categories)
+        return [_to_node(root, children_map) for root in children_map.get(None, [])]

pyproject.toml

@@ -19,6 +19,8 @@ dependencies = [
     "apscheduler>=3.10",
     "python-dotenv>=1.0",
     "oss2>=2.18.0",
+    "fastapi>=0.115.0",
+    "uvicorn[standard]>=0.32.0",
 ]
 
 [project.optional-dependencies]
@@ -30,11 +32,12 @@ dev = [
 ]
 
 [tool.hatch.build.targets.wheel]
-packages = ["supply_agent", "supply_infra", "agents"]
+packages = ["supply_agent", "supply_infra", "agents", "api"]
 
 [project.scripts]
 supply-scheduler = "supply_infra.scheduler.app:run_scheduler"
 supply-visualize = "supply_agent.logging.cli:main"
+supply-api = "api.run:main"
 
 [tool.ruff]
 line-length = 100

web/.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

web/README.md

@@ -0,0 +1,30 @@
+# 全局分类树前端
+
+Vue 3 + Vite 纯前端，横向展示 `global_tree_category` 分类树。
+
+## 开发
+
+先启动后端（仓库根目录，端口 8080）：
+
+```bash
+# 使用项目 venv
+.venv/bin/python -m api
+# 或
+.venv/bin/supply-api
+```
+
+再启动本前端：
+
+```bash
+cd web
+npm install
+npm run dev
+```
+
+浏览器打开 http://127.0.0.1:5173 ，`/api` 会代理到后端 `8080`。
+
+## 功能
+
+- 一次请求拉取整棵树，展开/收起全部由前端控制
+- 默认展开 3 层，可通过下拉选择展开到第 N 层
+- 节点旁 +/- 可手动展开或收起该节点子树

web/index.html

@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>全局分类树</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>

web/package-lock.json

@@ -0,0 +1,1239 @@
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+  "name": "web",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "web",
+      "version": "0.0.0",
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+        "vue": "^3.5.39"
+      },
+      "devDependencies": {
+        "@types/node": "^24.13.2",
+        "@vitejs/plugin-vue": "^6.0.7",
+        "@vue/tsconfig": "^0.9.1",
+        "typescript": "~6.0.2",
+        "vite": "^8.1.1",
+        "vue-tsc": "^3.3.5"
+      }
+    },
+    "node_modules/@babel/helper-string-parser": {
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+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
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web/package.json

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+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
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+    "preview": "vite preview"
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+  }
+}

web/public/icons.svg

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+  <symbol id="bluesky-icon" viewBox="0 0 16 17">
+    <g clip-path="url(#bluesky-clip)"><path fill="#08060d" d="M7.75 7.735c-.693-1.348-2.58-3.86-4.334-5.097-1.68-1.187-2.32-.981-2.74-.79C.188 2.065.1 2.812.1 3.251s.241 3.602.398 4.13c.52 1.744 2.367 2.333 4.07 2.145-2.495.37-4.71 1.278-1.805 4.512 3.196 3.309 4.38-.71 4.987-2.746.608 2.036 1.307 5.91 4.93 2.746 2.72-2.746.747-4.143-1.747-4.512 1.702.189 3.55-.4 4.07-2.145.156-.528.397-3.691.397-4.13s-.088-1.186-.575-1.406c-.42-.19-1.06-.395-2.741.79-1.755 1.24-3.64 3.752-4.334 5.099"/></g>
+    <defs><clipPath id="bluesky-clip"><path fill="#fff" d="M.1.85h15.3v15.3H.1z"/></clipPath></defs>
+  </symbol>
+  <symbol id="discord-icon" viewBox="0 0 20 19">
+    <path fill="#08060d" d="M16.224 3.768a14.5 14.5 0 0 0-3.67-1.153c-.158.286-.343.67-.47.976a13.5 13.5 0 0 0-4.067 0c-.128-.306-.317-.69-.476-.976A14.4 14.4 0 0 0 3.868 3.77C1.546 7.28.916 10.703 1.231 14.077a14.7 14.7 0 0 0 4.5 2.306q.545-.748.965-1.587a9.5 9.5 0 0 1-1.518-.74q.191-.14.372-.293c2.927 1.369 6.107 1.369 8.999 0q.183.152.372.294-.723.437-1.52.74.418.838.963 1.588a14.6 14.6 0 0 0 4.504-2.308c.37-3.911-.63-7.302-2.644-10.309m-9.13 8.234c-.878 0-1.599-.82-1.599-1.82 0-.998.705-1.82 1.6-1.82.894 0 1.614.82 1.599 1.82.001 1-.705 1.82-1.6 1.82m5.91 0c-.878 0-1.599-.82-1.599-1.82 0-.998.705-1.82 1.6-1.82.893 0 1.614.82 1.599 1.82 0 1-.706 1.82-1.6 1.82"/>
+  </symbol>
+  <symbol id="documentation-icon" viewBox="0 0 21 20">
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="m15.5 13.333 1.533 1.322c.645.555.967.833.967 1.178s-.322.623-.967 1.179L15.5 18.333m-3.333-5-1.534 1.322c-.644.555-.966.833-.966 1.178s.322.623.966 1.179l1.534 1.321"/>
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M17.167 10.836v-4.32c0-1.41 0-2.117-.224-2.68-.359-.906-1.118-1.621-2.08-1.96-.599-.21-1.349-.21-2.848-.21-2.623 0-3.935 0-4.983.369-1.684.591-3.013 1.842-3.641 3.428C3 6.449 3 7.684 3 10.154v2.122c0 2.558 0 3.838.706 4.726q.306.383.713.671c.76.536 1.79.64 3.581.66"/>
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M3 10a2.78 2.78 0 0 1 2.778-2.778c.555 0 1.209.097 1.748-.047.48-.129.854-.503.982-.982.145-.54.048-1.194.048-1.749a2.78 2.78 0 0 1 2.777-2.777"/>
+  </symbol>
+  <symbol id="github-icon" viewBox="0 0 19 19">
+    <path fill="#08060d" fill-rule="evenodd" d="M9.356 1.85C5.05 1.85 1.57 5.356 1.57 9.694a7.84 7.84 0 0 0 5.324 7.44c.387.079.528-.168.528-.376 0-.182-.013-.805-.013-1.454-2.165.467-2.616-.935-2.616-.935-.349-.91-.864-1.143-.864-1.143-.71-.48.051-.48.051-.48.787.051 1.2.805 1.2.805.695 1.194 1.817.857 2.268.649.064-.507.27-.857.49-1.052-1.728-.182-3.545-.857-3.545-3.87 0-.857.31-1.558.8-2.104-.078-.195-.349-1 .077-2.078 0 0 .657-.208 2.14.805a7.5 7.5 0 0 1 1.946-.26c.657 0 1.328.092 1.946.26 1.483-1.013 2.14-.805 2.14-.805.426 1.078.155 1.883.078 2.078.502.546.799 1.247.799 2.104 0 3.013-1.818 3.675-3.558 3.87.284.247.528.714.528 1.454 0 1.052-.012 1.896-.012 2.156 0 .208.142.455.528.377a7.84 7.84 0 0 0 5.324-7.441c.013-4.338-3.48-7.844-7.773-7.844" clip-rule="evenodd"/>
+  </symbol>
+  <symbol id="social-icon" viewBox="0 0 20 20">
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M12.5 6.667a4.167 4.167 0 1 0-8.334 0 4.167 4.167 0 0 0 8.334 0"/>
+    <path fill="none" stroke="#aa3bff" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.35" d="M2.5 16.667a5.833 5.833 0 0 1 8.75-5.053m3.837.474.513 1.035c.07.144.257.282.414.309l.93.155c.596.1.736.536.307.965l-.723.73a.64.64 0 0 0-.152.531l.207.903c.164.715-.213.991-.84.618l-.872-.52a.63.63 0 0 0-.577 0l-.872.52c-.624.373-1.003.094-.84-.618l.207-.903a.64.64 0 0 0-.152-.532l-.723-.729c-.426-.43-.289-.864.306-.964l.93-.156a.64.64 0 0 0 .412-.31l.513-1.034c.28-.562.735-.562 1.012 0"/>
+  </symbol>
+  <symbol id="x-icon" viewBox="0 0 19 19">
+    <path fill="#08060d" fill-rule="evenodd" d="M1.893 1.98c.052.072 1.245 1.769 2.653 3.77l2.892 4.114c.183.261.333.48.333.486s-.068.089-.152.183l-.522.593-.765.867-3.597 4.087c-.375.426-.734.834-.798.905a1 1 0 0 0-.118.148c0 .01.236.017.664.017h.663l.729-.83c.4-.457.796-.906.879-.999a692 692 0 0 0 1.794-2.038c.034-.037.301-.34.594-.675l.551-.624.345-.392a7 7 0 0 1 .34-.374c.006 0 .93 1.306 2.052 2.903l2.084 2.965.045.063h2.275c1.87 0 2.273-.003 2.266-.021-.008-.02-1.098-1.572-3.894-5.547-2.013-2.862-2.28-3.246-2.273-3.266.008-.019.282-.332 2.085-2.38l2-2.274 1.567-1.782c.022-.028-.016-.03-.65-.03h-.674l-.3.342a871 871 0 0 1-1.782 2.025c-.067.075-.405.458-.75.852a100 100 0 0 1-.803.91c-.148.172-.299.344-.99 1.127-.304.343-.32.358-.345.327-.015-.019-.904-1.282-1.976-2.808L6.365 1.85H1.8zm1.782.91 8.078 11.294c.772 1.08 1.413 1.973 1.425 1.984.016.017.241.02 1.05.017l1.03-.004-2.694-3.766L7.796 5.75 5.722 2.852l-1.039-.004-1.039-.004z" clip-rule="evenodd"/>
+  </symbol>
+</svg>

web/src/App.vue

@@ -0,0 +1,49 @@
+<script setup lang="ts">
+import { onMounted, ref } from 'vue'
+import CategoryTree from './components/CategoryTree.vue'
+import { fetchCategoryTree } from './api/category'
+import type { CategoryNode } from './types/category'
+
+const nodes = ref<CategoryNode[]>([])
+const loading = ref(true)
+const error = ref<string | null>(null)
+
+onMounted(async () => {
+  try {
+    const data = await fetchCategoryTree()
+    nodes.value = data.nodes ?? []
+  } catch (e) {
+    error.value = e instanceof Error ? e.message : String(e)
+  } finally {
+    loading.value = false
+  }
+})
+</script>
+
+<template>
+  <div class="page">
+    <div v-if="loading" class="state">正在加载分类树…</div>
+    <div v-else-if="error" class="state error">{{ error }}</div>
+    <CategoryTree v-else :nodes="nodes" />
+  </div>
+</template>
+
+<style scoped>
+.page {
+  max-width: 100%;
+  min-height: 100vh;
+  padding: 28px 32px;
+  box-sizing: border-box;
+}
+
+.state {
+  padding: 64px 24px;
+  text-align: center;
+  color: #64748b;
+  font-size: 15px;
+}
+
+.state.error {
+  color: #b91c1c;
+}
+</style>

web/src/api/category.ts

@@ -0,0 +1,9 @@
+import type { CategoryTreeResponse } from '../types/category'
+
+export async function fetchCategoryTree(): Promise<CategoryTreeResponse> {
+  const res = await fetch('/api/category-tree')
+  if (!res.ok) {
+    throw new Error(`加载分类树失败: ${res.status} ${res.statusText}`)
+  }
+  return res.json()
+}

web/src/assets/vue.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="37.07" height="36" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 198"><path fill="#41B883" d="M204.8 0H256L128 220.8L0 0h97.92L128 51.2L157.44 0h47.36Z"></path><path fill="#41B883" d="m0 0l128 220.8L256 0h-51.2L128 132.48L50.56 0H0Z"></path><path fill="#35495E" d="M50.56 0L128 133.12L204.8 0h-47.36L128 51.2L97.92 0H50.56Z"></path></svg>

web/src/components/CategoryTree.vue

@@ -0,0 +1,249 @@
+<script setup lang="ts">
+import { computed, ref, watch } from 'vue'
+import TreeNode from './TreeNode.vue'
+import type { CategoryNode } from '../types/category'
+import { maxTreeDepth } from '../types/category'
+
+const props = defineProps<{
+  nodes: CategoryNode[]
+}>()
+
+const DEFAULT_DEPTH = 3
+const COL_WIDTH = 180
+const COL_GAP = 36
+
+const expandDepth = ref(DEFAULT_DEPTH)
+const expandedMap = ref<Record<number, true>>({})
+const collapsedMap = ref<Record<number, true>>({})
+
+const treeMaxDepth = computed(() => maxTreeDepth(props.nodes))
+
+const depthOptions = computed(() => {
+  const max = Math.max(treeMaxDepth.value, DEFAULT_DEPTH)
+  return Array.from({ length: max }, (_, i) => i + 1)
+})
+
+/** 顶部层级栏：跟当前展示深度对齐；手动再展开时扩到整棵树最大层。 */
+const headerLevels = computed(() => {
+  let count = Math.max(expandDepth.value, 1)
+  if (Object.keys(expandedMap.value).length > 0) {
+    count = Math.max(count, treeMaxDepth.value)
+  }
+  if (treeMaxDepth.value > 0) {
+    count = Math.min(count, treeMaxDepth.value)
+  }
+  return Array.from({ length: count }, (_, i) => i + 1)
+})
+
+watch(expandDepth, () => {
+  expandedMap.value = {}
+  collapsedMap.value = {}
+})
+
+function findDepth(nodes: CategoryNode[], id: number, depth: number): number | null {
+  for (const node of nodes) {
+    if (node.id === id) return depth
+    const found = findDepth(node.children, id, depth + 1)
+    if (found != null) return found
+  }
+  return null
+}
+
+function toggleNode(id: number) {
+  const wasCollapsed = !!collapsedMap.value[id]
+  const wasExpanded = !!expandedMap.value[id]
+
+  const nextExpanded = { ...expandedMap.value }
+  const nextCollapsed = { ...collapsedMap.value }
+  delete nextExpanded[id]
+  delete nextCollapsed[id]
+
+  if (wasCollapsed) {
+    nextExpanded[id] = true
+  } else if (wasExpanded) {
+    nextCollapsed[id] = true
+  } else {
+    const depth = findDepth(props.nodes, id, 1)
+    const autoOpen = depth != null && depth < expandDepth.value
+    if (autoOpen) {
+      nextCollapsed[id] = true
+    } else {
+      nextExpanded[id] = true
+    }
+  }
+
+  expandedMap.value = nextExpanded
+  collapsedMap.value = nextCollapsed
+}
+
+function expandAll() {
+  expandDepth.value = treeMaxDepth.value || 1
+}
+</script>
+
+<template>
+  <div
+    class="category-tree"
+    :style="{ '--col-width': `${COL_WIDTH}px`, '--col-gap': `${COL_GAP}px` }"
+  >
+    <header class="toolbar">
+      <h1>全局分类树</h1>
+      <div class="controls">
+        <label class="control">
+          <span>展开到第</span>
+          <select v-model.number="expandDepth">
+            <option v-for="n in depthOptions" :key="n" :value="n">{{ n }}</option>
+          </select>
+          <span>层</span>
+        </label>
+        <button type="button" class="btn" @click="expandAll">全部展开</button>
+        <span class="hint">共 {{ treeMaxDepth }} 层 · 点击节点旁 +/− 手动展开/收起</span>
+      </div>
+    </header>
+
+    <div v-if="!nodes.length" class="empty">暂无分类数据</div>
+    <div v-else class="tree-panel">
+      <div class="level-headers">
+        <div
+          v-for="n in headerLevels"
+          :key="n"
+          class="level-header"
+        >
+          第 {{ n }} 层
+        </div>
+      </div>
+      <div class="forest">
+        <TreeNode
+          v-for="node in nodes"
+          :key="node.id"
+          :node="node"
+          :depth="1"
+          :expand-depth="expandDepth"
+          :expanded-map="expandedMap"
+          :collapsed-map="collapsedMap"
+          @toggle="toggleNode"
+        />
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.category-tree {
+  display: flex;
+  flex-direction: column;
+  gap: 20px;
+  min-height: 100%;
+}
+
+.toolbar {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: baseline;
+  justify-content: space-between;
+  gap: 12px 24px;
+  padding-bottom: 16px;
+  border-bottom: 1px solid #e2e8f0;
+}
+
+.toolbar h1 {
+  margin: 0;
+  font-size: 22px;
+  font-weight: 700;
+  color: #0f172a;
+  letter-spacing: -0.02em;
+}
+
+.controls {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 10px 14px;
+}
+
+.control {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 14px;
+  color: #334155;
+}
+
+.control select {
+  height: 32px;
+  padding: 0 8px;
+  border: 1px solid #cbd5e1;
+  border-radius: 6px;
+  background: #fff;
+  font-size: 14px;
+  color: #0f172a;
+}
+
+.btn {
+  height: 32px;
+  padding: 0 12px;
+  border: 1px solid #334155;
+  border-radius: 6px;
+  background: #0f172a;
+  color: #fff;
+  font-size: 13px;
+  cursor: pointer;
+}
+
+.btn:hover {
+  background: #1e293b;
+}
+
+.hint {
+  font-size: 12px;
+  color: #94a3b8;
+}
+
+.tree-panel {
+  overflow: auto;
+  padding: 0 4px 32px;
+}
+
+.level-headers {
+  display: flex;
+  flex-direction: row;
+  align-items: stretch;
+  position: sticky;
+  top: 0;
+  z-index: 2;
+  background: rgba(241, 245, 249, 0.92);
+  backdrop-filter: blur(6px);
+  border-bottom: 1px solid #e2e8f0;
+  margin-bottom: 12px;
+  padding: 8px 0;
+}
+
+.level-header {
+  width: var(--col-width, 180px);
+  flex-shrink: 0;
+  margin-right: var(--col-gap, 36px);
+  text-align: center;
+  font-size: 13px;
+  font-weight: 600;
+  color: #475569;
+  letter-spacing: 0.02em;
+}
+
+.level-header:last-child {
+  margin-right: 0;
+}
+
+.forest {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 16px;
+}
+
+.empty {
+  padding: 48px;
+  text-align: center;
+  color: #94a3b8;
+  font-size: 15px;
+}
+</style>

web/src/components/TreeNode.vue

@@ -0,0 +1,207 @@
+<script setup lang="ts">
+import type { CategoryNode } from '../types/category'
+
+const props = defineProps<{
+  node: CategoryNode
+  depth: number
+  expandDepth: number
+  expandedMap: Record<number, true>
+  collapsedMap: Record<number, true>
+}>()
+
+const emit = defineEmits<{
+  toggle: [id: number]
+}>()
+
+const hasChildren = () => props.node.children.length > 0
+
+function isExpanded(): boolean {
+  if (!hasChildren()) return false
+  if (props.collapsedMap[props.node.id]) return false
+  if (props.expandedMap[props.node.id]) return true
+  return props.depth < props.expandDepth
+}
+</script>
+
+<template>
+  <div class="tree-node">
+    <div class="node-card" :class="{ leaf: !hasChildren(), open: isExpanded() }">
+      <button
+        v-if="hasChildren()"
+        class="toggle"
+        type="button"
+        :aria-expanded="isExpanded()"
+        :title="isExpanded() ? '收起' : '展开'"
+        @click="emit('toggle', node.id)"
+      >
+        {{ isExpanded() ? '−' : '+' }}
+      </button>
+      <span v-else class="toggle-spacer" />
+      <div class="node-name">{{ node.name || '(未命名)' }}</div>
+    </div>
+
+    <ul v-if="hasChildren() && isExpanded()" class="children">
+      <li
+        v-for="child in node.children"
+        :key="child.id"
+        class="child"
+      >
+        <TreeNode
+          :node="child"
+          :depth="depth + 1"
+          :expand-depth="expandDepth"
+          :expanded-map="expandedMap"
+          :collapsed-map="collapsedMap"
+          @toggle="emit('toggle', $event)"
+        />
+      </li>
+    </ul>
+  </div>
+</template>
+
+<style scoped>
+/* 节点卡片垂直中线，用于对齐连线 */
+.tree-node {
+  --line-y: 20px;
+  --line-color: #cbd5e1;
+  --gap: var(--col-gap, 36px);
+
+  display: flex;
+  flex-direction: row;
+  align-items: flex-start;
+}
+
+.node-card {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  width: var(--col-width, 180px);
+  min-height: 40px;
+  padding: 8px 10px;
+  border: 1px solid #d8dee6;
+  border-radius: 8px;
+  background: #fff;
+  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
+  flex-shrink: 0;
+  box-sizing: border-box;
+}
+
+.node-card.open {
+  border-color: #9eb6d4;
+  background: #f7faff;
+}
+
+.node-card.leaf {
+  border-style: dashed;
+  background: #fafbfc;
+}
+
+.toggle {
+  width: 22px;
+  height: 22px;
+  border: 1px solid #c5ced9;
+  border-radius: 4px;
+  background: #fff;
+  color: #334155;
+  font-size: 14px;
+  line-height: 1;
+  cursor: pointer;
+  flex-shrink: 0;
+  padding: 0;
+}
+
+.toggle:hover {
+  border-color: #64748b;
+  background: #f1f5f9;
+}
+
+.toggle-spacer {
+  width: 22px;
+  flex-shrink: 0;
+}
+
+.node-name {
+  flex: 1;
+  min-width: 0;
+  font-size: 14px;
+  font-weight: 600;
+  color: #0f172a;
+  line-height: 1.35;
+  word-break: break-word;
+}
+
+.children {
+  --half-gap: calc(var(--gap) / 2);
+  --sibling-gap: 10px;
+
+  display: flex;
+  flex-direction: column;
+  /* 不用 flex gap：空隙不在子项盒模型内，竖线会断开 */
+  list-style: none;
+  margin: 0;
+  padding: 0 0 0 var(--gap);
+  position: relative;
+}
+
+/* 父节点 → 竖脊：左半段水平线 */
+.children::before {
+  content: '';
+  position: absolute;
+  left: 0;
+  top: var(--line-y);
+  width: var(--half-gap);
+  border-top: 2px solid var(--line-color);
+}
+
+.child {
+  position: relative;
+}
+
+/* 间距放进 padding，让竖脊 ::after 能连续穿过 */
+.child:not(:last-child) {
+  padding-bottom: var(--sibling-gap);
+}
+
+/* 竖脊 → 子节点：右半段水平线 */
+.child::before {
+  content: '';
+  position: absolute;
+  top: var(--line-y);
+  left: 0;
+  width: var(--half-gap);
+  margin-left: calc(-1 * var(--half-gap));
+  border-top: 2px solid var(--line-color);
+}
+
+/* 兄弟之间的竖脊（位于 gap 中点） */
+.child::after {
+  content: '';
+  position: absolute;
+  left: 0;
+  margin-left: calc(-1 * var(--half-gap));
+  border-left: 2px solid var(--line-color);
+}
+
+/* 中间兄弟：通栏竖线（含底部 padding） */
+.child:not(:first-child):not(:last-child)::after {
+  top: 0;
+  bottom: 0;
+}
+
+/* 第一个兄弟：从中线画到自身底部（含 padding） */
+.child:first-child:not(:last-child)::after {
+  top: var(--line-y);
+  bottom: 0;
+}
+
+/* 最后一个兄弟：从顶部画到中线 */
+.child:last-child:not(:first-child)::after {
+  top: 0;
+  height: var(--line-y);
+}
+
+/* 唯一子节点：无需竖脊（水平线已贯通） */
+.child:only-child::after {
+  display: none;
+}
+</style>

web/src/main.ts

@@ -0,0 +1,5 @@
+import { createApp } from 'vue'
+import './style.css'
+import App from './App.vue'
+
+createApp(App).mount('#app')

web/src/style.css

@@ -0,0 +1,35 @@
+:root {
+  font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+  color: #0f172a;
+  background: #f1f5f9;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html,
+body,
+#app {
+  margin: 0;
+  min-width: 320px;
+  min-height: 100%;
+}
+
+body {
+  background:
+    radial-gradient(ellipse 80% 50% at 0% 0%, #e0e7ff 0%, transparent 55%),
+    radial-gradient(ellipse 60% 40% at 100% 0%, #dbeafe 0%, transparent 50%),
+    #f1f5f9;
+}
+
+button,
+select {
+  font-family: inherit;
+}

web/src/types/category.ts

@@ -0,0 +1,22 @@
+export interface CategoryNode {
+  id: number
+  name: string | null
+  level: number | null
+  description: string | null
+  children: CategoryNode[]
+}
+
+export interface CategoryTreeResponse {
+  nodes: CategoryNode[]
+}
+
+export function maxTreeDepth(nodes: CategoryNode[], depth = 1): number {
+  if (!nodes.length) return 0
+  let max = depth
+  for (const node of nodes) {
+    if (node.children.length) {
+      max = Math.max(max, maxTreeDepth(node.children, depth + 1))
+    }
+  }
+  return max
+}

web/tsconfig.app.json

@@ -0,0 +1,15 @@
+{
+  "extends": "@vue/tsconfig/tsconfig.dom.json",
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "types": ["vite/client"],
+    "allowArbitraryExtensions": true,
+
+    /* Linting */
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx", "src/**/*.vue"]
+}

web/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}

web/tsconfig.node.json

@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "es2023",
+    "lib": ["ES2023"],
+    "types": ["node"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "module": "nodenext",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["vite.config.ts"]
+}

web/vite.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+export default defineConfig({
+  plugins: [vue()],
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': {
+        target: 'http://127.0.0.1:8080',
+        changeOrigin: true,
+      },
+    },
+  },
+})