refactor(web): 前端目录重构 — consoles/pages → layouts/features + shared

- consoles/admin/ → layouts/admin-layout/
- consoles/workbench/ → layouts/workbench-layout/ + features/chat/
- pages/ → features/ (dashboard, models, projects, not-found)
- components/ → shared/components/
- hooks/ → shared/hooks/
- utils/ → shared/utils/
- 更新所有 import 路径 (src/web/ + tests/web/)
- 更新开发文档 (README.md, frontend.md, architecture.md)

docs/development/architecture.md

@@ -45,6 +45,9 @@ Request -> Bun.serve routes 声明式匹配 -> routes/*.ts handler -> helpers/
 | `src/server/ai/`          | AI Provider Registry + Agent + 工具                      |
 | `src/server/helpers/`     | 响应格式化、URL 工具                                     |
 | `src/server/middleware/`  | 参数校验 + 错误处理                                      |
+| `src/web/layouts/`        | 前端布局组件（AdminLayout / WorkbenchLayout）            |
+| `src/web/features/`       | 前端功能模块（dashboard / projects / models / chat）     |
+| `src/web/shared/`         | 前端共享代码（components / hooks / utils）               |
 | `src/shared/api.ts`       | 前后端共享 API 类型                                      |
 | `src/shared/app.ts`       | 应用全局常量                                             |