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/adminMgr.ts

@@ -0,0 +1,76 @@
+import { apiClient } from './client'
+
+import type { ApiResponse, PaginatedResult } from './types'
+
+export interface AdminRole {
+  id: number
+  code: string
+  name: string
+  description: string
+}
+
+export interface AdminMgrUser {
+  id: number
+  username: string
+  nickname: string
+  status: string
+  roles: AdminRole[]
+  last_login_at?: string
+  created_at: string
+  updated_at: string
+}
+
+export interface CreateAdminRequest {
+  username: string
+  password: string
+  nickname?: string
+}
+
+export interface UpdateAdminRequest {
+  nickname?: string
+  status?: string
+}
+
+export interface ChangePasswordRequest {
+  old_password: string
+  new_password: string
+}
+
+export async function fetchAdminMgrUsers(page = 1, pageSize = 20) {
+  const { data } = await apiClient.get<ApiResponse<PaginatedResult<AdminMgrUser>>>('/admin/admin-users', {
+    params: { page, page_size: pageSize },
+  })
+  return data.data
+}
+
+export async function fetchAdminMgrUser(id: number) {
+  const { data } = await apiClient.get<ApiResponse<AdminMgrUser>>(`/admin/admin-users/${id}`)
+  return data.data
+}
+
+export async function createAdminMgrUser(req: CreateAdminRequest) {
+  const { data } = await apiClient.post<ApiResponse<AdminMgrUser>>('/admin/admin-users', req)
+  return data.data
+}
+
+export async function updateAdminMgrUser(id: number, req: UpdateAdminRequest) {
+  const { data } = await apiClient.put<ApiResponse<AdminMgrUser>>(`/admin/admin-users/${id}`, req)
+  return data.data
+}
+
+export async function deleteAdminMgrUser(id: number) {
+  const { data } = await apiClient.delete<ApiResponse<{ deleted: boolean }>>(`/admin/admin-users/${id}`)
+  return data.data
+}
+
+export async function assignAdminRoles(id: number, roleIds: number[]) {
+  const { data } = await apiClient.put<ApiResponse<{ updated: boolean }>>(`/admin/admin-users/${id}/roles`, {
+    role_ids: roleIds,
+  })
+  return data.data
+}
+
+export async function changeAdminPassword(id: number, req: ChangePasswordRequest) {
+  const { data } = await apiClient.put<ApiResponse<{ updated: boolean }>>(`/admin/admin-users/${id}/password`, req)
+  return data.data
+}