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/disputes/api/disputes.ts

@@ -0,0 +1,47 @@
+import { apiClient } from './client'
+
+import type { ApiResponse, PaginatedResult } from './types'
+import type { DisputeStatus } from '@/types/status'
+
+export interface Dispute {
+  id: number
+  order_id: number
+  order_no: string
+  title: string
+  initiator_id: number
+  target_user_id: number
+  type: string
+  status: DisputeStatus
+  description: string
+  evidence_urls?: string[]
+  arbitration_result: string
+  arbitration_remark: string
+  handled_by?: number
+  handled_at?: string
+  created_at: string
+  updated_at: string
+}
+
+export async function createDispute(orderId: number, payload: { type: string; description: string; evidence_urls?: string[] }) {
+  const { data } = await apiClient.post<ApiResponse<Dispute>>(`/orders/${orderId}/dispute`, payload)
+  return data.data
+}
+
+export async function fetchDisputes(page = 1, pageSize = 20) {
+  const { data } = await apiClient.get<ApiResponse<PaginatedResult<Dispute>>>('/disputes', {
+    params: { page, page_size: pageSize },
+  })
+  return data.data
+}
+
+export async function fetchAdminDisputes(page = 1, pageSize = 20) {
+  const { data } = await apiClient.get<ApiResponse<PaginatedResult<Dispute>>>('/admin/disputes', {
+    params: { page, page_size: pageSize },
+  })
+  return data.data
+}
+
+export async function arbitrateDispute(id: number, payload: { result: string; remark: string; amount?: number }) {
+  const { data } = await apiClient.post<ApiResponse<Dispute>>(`/admin/disputes/${id}/arbitrate`, payload)
+  return data.data
+}