fix: 修复飞书免登功能，添加 H5 JSSDK 和 appId 自动获取

后端改动：
- 新增 /api/v1/auth/feishu-config 接口，根据 company 参数返回对应 appId

前端改动：
- 添加飞书 H5 JSSDK (h5-js-sdk-1.5.19.js)
- 修改登录页免登逻辑：先从后端获取 appId，再调用 tt.requestAuthCode
- 新增飞书环境检测测试页面 (/feishu-env-test)
- 移除测试页面的自动轮询逻辑

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/router/index.tsx

@@ -16,6 +16,7 @@ import RejectPage from '@/pages/approval/reject'
 import Login from '@/pages/login'
 import SimpleLogin from '@/pages/login-simple'
 import DebugFeishu from '@/pages/debug-feishu'
+import FeishuEnvTest from '@/pages/feishu-env-test'
 
 const router = createBrowserRouter([
   {
@@ -43,6 +44,7 @@ const router = createBrowserRouter([
   { path: '/login', element: <Login /> },
   { path: '/login-simple', element: <SimpleLogin /> },
   { path: '/debug-feishu', element: <DebugFeishu /> },
+  { path: '/feishu-env-test', element: <FeishuEnvTest /> },
   { path: '/approval/quick-action', element: <QuickAction /> },
   { path: '/approval/reject', element: <RejectPage /> },
   { path: '*', element: <Navigate to='/login' replace /> },