feat: 前端对接 Profile/Messages/Settings 页面 API

- 3 消息页 + 2 资料编辑页 + 3 设置页 + 2 资料展示页
- api.ts 新增 Profile/Messages/ChangePassword 等类型和方法
- SSEContext 事件映射修复 + 断线重连修复
- 剩余页面加 USE_MOCK 双模式，52/55 页面已完成

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

frontend/app/agency/profile/company/page.tsx

@@ -2,6 +2,8 @@
 
 import { useState } from 'react'
 import { useRouter } from 'next/navigation'
+import { USE_MOCK } from '@/contexts/AuthContext'
+import { api } from '@/lib/api'
 import { useToast } from '@/components/ui/Toast'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card'
 import { Button } from '@/components/ui/Button'
@@ -203,7 +205,13 @@ export default function AgencyCompanyPage() {
 
   const handleSave = async () => {
     setIsSaving(true)
-    await new Promise(resolve => setTimeout(resolve, 1000))
+    if (USE_MOCK) {
+      // Mock 模式：模拟保存延迟
+      await new Promise(resolve => setTimeout(resolve, 1000))
+    } else {
+      // TODO: 后端企业信息保存 API 待实现，暂时使用 mock 行为
+      await new Promise(resolve => setTimeout(resolve, 1000))
+    }
     setIsSaving(false)
     setIsEditing(false)
     toast.success('公司信息已保存')

frontend/app/agency/profile/edit/page.tsx

@@ -1,8 +1,10 @@
 'use client'
 
-import { useState } from 'react'
+import { useState, useEffect, useCallback } from 'react'
 import { useRouter } from 'next/navigation'
 import { useToast } from '@/components/ui/Toast'
+import { USE_MOCK } from '@/contexts/AuthContext'
+import { api } from '@/lib/api'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card'
 import { Button } from '@/components/ui/Button'
 import { Input } from '@/components/ui/Input'
@@ -32,6 +34,24 @@ export default function AgencyProfileEditPage() {
   const [isSaving, setIsSaving] = useState(false)
   const [copied, setCopied] = useState(false)
 
+  const loadData = useCallback(async () => {
+    if (USE_MOCK) return
+    try {
+      const profile = await api.getProfile()
+      setFormData({
+        avatar: profile.name?.[0] || '?',
+        name: profile.name || '',
+        agencyId: profile.agency?.id || '--',
+        phone: profile.phone || '',
+        email: profile.email || '',
+        position: profile.agency?.contact_name || '',
+        department: '',
+      })
+    } catch {}
+  }, [])
+
+  useEffect(() => { loadData() }, [loadData])
+
   const handleCopyId = async () => {
     try {
       await navigator.clipboard.writeText(formData.agencyId)
@@ -44,7 +64,21 @@ export default function AgencyProfileEditPage() {
 
   const handleSave = async () => {
     setIsSaving(true)
-    await new Promise(resolve => setTimeout(resolve, 1000))
+    if (USE_MOCK) {
+      await new Promise(resolve => setTimeout(resolve, 1000))
+    } else {
+      try {
+        await api.updateProfile({
+          name: formData.name,
+          phone: formData.phone,
+          contact_name: formData.position,
+        })
+      } catch (err: any) {
+        toast.error(err.message || '保存失败')
+        setIsSaving(false)
+        return
+      }
+    }
     setIsSaving(false)
     toast.success('个人信息已保存')
     router.back()