feat: P3阶段完成 - 全部模块迁移完成 🎉

## P3.1: 争议仲裁模块（disputes）✅
- API: disputes.ts
- 模块导出

## P3.2: 卖家中心模块（seller）✅
- Views: 4个页面
- Composables: usePublishForm, usePublishDraft
- 模块导出

## P3.3: 管理后台模块（admin）✅
- API: 8个文件（adminAuth, adminDashboard, adminUsers等）
- Views: 15个管理页面
- Composables: useAdminTable, useAdminPaginatedTable
- Components: 管理端组件
- 模块导出

---

## 🎉 Features 架构迁移全部完成！

### 最终统计
- ✅ P0: shared（基础设施）- 22个文件
- ✅ P1: wallet, chats, orders - 24个文件
- ✅ P2: listings, auth - 35个文件
- ✅ P3: seller, disputes, admin - 47个文件

**总计：** 9个模块，128个文件完成迁移

### 新架构
```
frontend/src/
├── features/          # 9个业务模块 ✅
│   ├── wallet/       ✅
│   ├── chats/        ✅
│   ├── orders/       ✅ (已重构)
│   ├── listings/     ✅
│   ├── auth/         ✅
│   ├── seller/       ✅
│   ├── disputes/     ✅
│   └── admin/        ✅
└── shared/           ✅
```

下一步：清理旧文件、更新路由配置

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/features/admin/api/adminAuth.ts

@@ -0,0 +1,74 @@
+import axios from 'axios'
+
+import { apiClient } from './client'
+import type { ApiResponse } from './types'
+import { getRefreshToken, setAuthTokens } from '@/utils/authStorage'
+import type { UserStatus } from '@/types/status'
+
+export interface AdminRole {
+  id: number
+  code: string
+  name: string
+}
+
+export interface AdminUser {
+  id: number
+  username: string
+  nickname: string
+  status: UserStatus
+  roles: AdminRole[]
+  permissions: string[]
+  last_login_at?: string
+}
+
+export interface AdminTokenPair {
+  access_token: string
+  refresh_token: string
+  token_type: string
+  expires_in: number
+}
+
+export interface AdminLoginData {
+  admin: AdminUser
+  tokens: AdminTokenPair
+}
+
+export interface AdminCaptcha {
+  captcha_id: string
+  image: string
+  expires_in: number
+}
+
+export async function fetchAdminCaptcha() {
+  const { data } = await apiClient.get<ApiResponse<AdminCaptcha>>('/admin/auth/captcha')
+  return data.data
+}
+
+export async function loginAdmin(username: string, password: string, captchaId: string, captchaCode: string) {
+  const { data } = await apiClient.post<ApiResponse<AdminLoginData>>('/admin/auth/login', {
+    username,
+    password,
+    captcha_id: captchaId,
+    captcha_code: captchaCode,
+  })
+  return data.data
+}
+
+export async function fetchAdminMe() {
+  const { data } = await apiClient.get<ApiResponse<AdminUser>>('/admin/me')
+  return data.data
+}
+
+export async function logoutAdmin() {
+  const { data } = await apiClient.post<ApiResponse<{ logged_out: boolean }>>('/admin/auth/logout')
+  return data.data
+}
+
+/** Manually refresh admin token (uses raw axios to avoid interceptor recursion) */
+export async function refreshAdminSession() {
+  const refreshToken = getRefreshToken('admin')
+  if (!refreshToken) throw new Error('no refresh token')
+  const { data } = await axios.post<ApiResponse<AdminTokenPair>>('/api/admin/auth/refresh', { refresh_token: refreshToken }, { timeout: 10000 })
+  setAuthTokens('admin', data.data)
+  return data.data
+}