fix: 修复前端导航和页面跳转问题

- 添加统一的导航菜单到所有页面
- 修复页面路由映射和高亮状态
- 创建 navigation.js 统一管理页面跳转
- 添加 test_navigation.py 路由测试工具
- 支持仪表板、预警管理、智能对话、HTTP对话页面间无缝切换

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.vscode/settings.json

@@ -21,5 +21,6 @@
     "[markdown]": {
         "files.encoding": "utf8"
     },
-    "python.defaultInterpreterPath": "${workspaceFolder}/.venv/Scripts/python.exe"
+    "python.defaultInterpreterPath": "${workspaceFolder}/.venv/Scripts/python.exe",
+    "Codegeex.RepoIndex": true
 }