修复(浏览器): 补齐数据库下载辅助依赖

在 browser 和 all 可选依赖组中声明 PyMySQL 与 DBUtils，确保浏览器数据库辅助能力安装后可以直接运行。

agent/pyproject.toml

@@ -24,6 +24,8 @@ dev = [
 browser = [
     "browser-use>=0.11.0",
     "langchain_core>=0.3.0",
+    "PyMySQL>=1.1.0",
+    "DBUtils>=3.1.0",
 ]
 server = [
     "fastapi>=0.115.0",
@@ -36,6 +38,8 @@ feishu = [
 all = [
     "browser-use>=0.11.0",
     "langchain_core>=0.3.0",
+    "PyMySQL>=1.1.0",
+    "DBUtils>=3.1.0",
     "fastapi>=0.115.0",
     "uvicorn[standard]>=0.32.0",
     "websockets>=13.0",