feat: 添加飞书免登自动登录功能

修改内容：
1. approval/detail.tsx - 在加载详情前检查登录状态，如果在飞书内则自动免登
2. login/index.tsx - 改进飞书环境检测和tt对象注入逻辑

业务流程：
1. 用户在飞书中点击消息按钮
2. 打开审批详情页 → 检测未登录
3. 如果在飞书客户端内 → 自动调用 tt.requestAuthCode
4. 免登成功 → 自动加载详情
5. 免登失败 → 跳转到登录页面

相关文件：
- frontend/src/pages/approval/detail.tsx
- frontend/src/pages/login/index.tsx

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

frontend/src/pages/approval/detail.tsx

@@ -11,9 +11,18 @@ import {
 } from 'antd-mobile-icons'
 import { approvalApi } from '../../services/api'
 import { useUserStore } from '@/stores/user'
+import { authApi } from '../../services/api'
 import dayjs from 'dayjs'
 import styles from './detail.module.css'
 
+// 声明飞书 JSAPI 类型
+declare global {
+  interface Window {
+    tt?: any
+    ttjsBridge?: any
+  }
+}
+
 // 状态配置
 const statusConfig: Record<string, { color: string; icon: React.ReactNode; text: string }> = {
   draft: { color: 'default', icon: <ClockCircleOutline />, text: '草稿' },
@@ -99,18 +108,80 @@ export default function ApprovalDetail() {
   const navigate = useNavigate()
   const { id } = useParams()
   const location = useLocation()
-  const { user } = useUserStore()
+  const { user, login } = useUserStore()
 
   const [detail, setDetail] = useState<ApprovalDetail | null>(null)
   const [loading, setLoading] = useState(true)
   const [commentVisible, setCommentVisible] = useState(false)
   const [comment, setComment] = useState('')
   const [actionType, setActionType] = useState<'approve' | 'reject' | 'cancel'>('approve')
+  const [tryingFeishuLogin, setTryingFeishuLogin] = useState(false)
+
+  // 飞书免登
+  const tryFeishuLogin = (): Promise<boolean> => {
+    return new Promise((resolve) => {
+      const ua = navigator.userAgent
+      const isInFeishu = ua.includes('Lark') || ua.includes('feishu') || ua.includes('lark')
+
+      if (!isInFeishu || !window.tt) {
+        console.log('❌ 不在飞书内或 tt 对象不可用')
+        resolve(false)
+        return
+      }
+
+      console.log('🚀 尝试飞书免登')
+      const appId = 'cli_a8033d607cba500d'
+
+      window.tt.requestAuthCode({
+        appId: appId,
+        success: async (res: any) => {
+          console.log('✅ 飞书免登成功:', res.code?.substring(0, 20))
+          try {
+            const result = await authApi.feishuLogin(res.code)
+            login(result.user, result.token)
+            Toast.show('登录成功')
+            resolve(true)
+          } catch (error) {
+            console.error('❌ 飞书登录API失败:', error)
+            resolve(false)
+          }
+        },
+        fail: (error: any) => {
+          console.error('❌ 飞书免登失败:', error)
+          resolve(false)
+        },
+      })
+    })
+  }
 
   // 加载详情
   const loadDetail = async () => {
     if (!id) return
 
+    // 检查登录状态，如果未登录且在飞书内，先尝试飞书免登
+    const token = localStorage.getItem('token')
+    const isLoggedIn = !!user
+
+    if (!isLoggedIn && !token) {
+      const ua = navigator.userAgent
+      const isInFeishu = ua.includes('Lark') || ua.includes('feishu') || ua.includes('lark')
+
+      if (isInFeishu && window.tt && !tryingFeishuLogin) {
+        setTryingFeishuLogin(true)
+        const success = await tryFeishuLogin()
+        setTryingFeishuLogin(false)
+        if (!success) {
+          // 免登失败，跳转到登录页面
+          window.location.href = '/login?redirect=' + encodeURIComponent(window.location.pathname + window.location.search)
+          return
+        }
+      } else {
+        // 不在飞书内或免登不可用，跳转到登录页面
+        window.location.href = '/login?redirect=' + encodeURIComponent(window.location.pathname + window.location.search)
+        return
+      }
+    }
+
     setLoading(true)
     try {
       const data = await approvalApi.getDetail(Number(id))