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/components/RoleDialog.vue

@@ -0,0 +1,116 @@
+<script setup lang="ts">
+import { ElMessage } from 'element-plus'
+import { ref, watch } from 'vue'
+
+import { createRole, updateRole, type Role, type CreateRoleRequest, type UpdateRoleRequest } from '@/api/adminRoles'
+
+const props = defineProps<{
+  modelValue: boolean
+  role?: Role | null
+}>()
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', val: boolean): void
+  (e: 'saved'): void
+}>()
+
+const submitting = ref(false)
+const form = ref({
+  code: '',
+  name: '',
+  description: '',
+})
+
+const isEdit = ref(false)
+
+watch(
+  () => props.modelValue,
+  (val) => {
+    if (val) {
+      if (props.role) {
+        isEdit.value = true
+        form.value = {
+          code: props.role.code,
+          name: props.role.name,
+          description: props.role.description,
+        }
+      } else {
+        isEdit.value = false
+        form.value = { code: '', name: '', description: '' }
+      }
+    }
+  },
+  { immediate: true },
+)
+
+async function handleSave() {
+  submitting.value = true
+  try {
+    if (isEdit.value && props.role) {
+      const req: UpdateRoleRequest = {
+        name: form.value.name,
+        description: form.value.description,
+      }
+      await updateRole(props.role.id, req)
+      ElMessage.success('角色已更新')
+    } else {
+      const req: CreateRoleRequest = {
+        code: form.value.code,
+        name: form.value.name,
+        description: form.value.description,
+      }
+      await createRole(req)
+      ElMessage.success('角色已创建')
+    }
+    emit('saved')
+    emit('update:modelValue', false)
+  } catch (error) {
+    ElMessage.error(readError(error, '操作失败'))
+  } finally {
+    submitting.value = false
+  }
+}
+
+function readError(error: unknown, fallback: string) {
+  if (typeof error === 'object' && error && 'response' in error) {
+    const response = (error as { response?: { data?: { message?: string } } }).response
+    return response?.data?.message || fallback
+  }
+  return fallback
+}
+</script>
+
+<template>
+  <el-dialog
+    :model-value="modelValue"
+    :title="isEdit ? '编辑角色' : '新建角色'"
+    width="500px"
+    @update:model-value="emit('update:modelValue', $event)"
+  >
+    <div class="dialog-body">
+      <el-form-item label="角色编码" class="full-control">
+        <el-input v-model="form.code" :disabled="isEdit" placeholder="例如: cs, ops, finance" />
+      </el-form-item>
+      <el-form-item label="角色名称" class="full-control">
+        <el-input v-model="form.name" placeholder="例如: 客服, 运营, 财务" />
+      </el-form-item>
+      <el-form-item label="描述" class="full-control">
+        <el-input v-model="form.description" type="textarea" :rows="3" placeholder="角色描述" />
+      </el-form-item>
+    </div>
+    <template #footer>
+      <el-button @click="emit('update:modelValue', false)">取消</el-button>
+      <el-button type="primary" :loading="submitting" @click="handleSave">保存</el-button>
+    </template>
+  </el-dialog>
+</template>
+
+<style scoped>
+.dialog-body {
+  display: grid;
+  gap: 16px;
+}
+.full-control {
+  width: 100%;
+}
+</style>