test(可视化E2E): 删除过时的 fake graph 场景

移除只验证固定 Phase 卡片和假 Inspector 的浏览器测试，避免继续把已废弃的演示合同当作产品验收标准。

visualization/frontend/tests/e2e/fake-graph.spec.ts

@@ -1,15 +0,0 @@
-import { expect, test } from "@playwright/test";
-
-test("renders the fine-grained fake graph and opens exact fields", async ({ page }) => {
-  await page.goto("/");
-  await expect(page.getByText("Mission Control")).toBeVisible();
-  await expect(page.getByText("FAKE DATA")).toBeVisible();
-  await expect(page.locator(".flowCard")).toHaveCount(103);
-  await page.screenshot({ path: "../test-artifacts/mission-control.png" });
-  await page.locator('[data-node-id="root-delivery:artifact"]').click();
-  await expect(page.locator(".inspector")).toBeVisible();
-  await expect(page.locator(".modelBanner")).toContainText("RootDeliveryManifestV1");
-  await expect(page.locator(".inspectorScroll")).toContainText("legacy_projection_digest");
-  await page.getByRole("button", { name: "字段合同" }).click();
-  await expect(page.locator(".contractFields li")).toHaveCount(8);
-});