feat: 添加"抄送我的"审批列表选项

后端修改：
- ApprovalService::getList 添加 'cc' 类型查询
- 从 form_data.cc_users 中查找包含当前用户的订单
- 兼容两种数据格式：[{id:29}] 或 [29]

前端修改：
- 添加"抄送我的"标签页
- 更新类型定义支持 'cc' 类型
- approvalListParams 类型添加 'cc' 选项

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

frontend/src/modules/approval/types.ts

@@ -106,7 +106,7 @@ export interface ApprovalActionParams {
 
 // 列表查询参数
 export interface ApprovalListParams {
-  type?: 'my' | 'pending' | 'approved'
+  type?: 'my' | 'pending' | 'approved' | 'cc'
   page?: number
   pageSize?: number
 }

frontend/src/pages/approval/list.tsx

@@ -46,7 +46,7 @@ export default function ApprovalList() {
   const { t } = useTranslation()
   const navigate = useNavigate()
 
-  const [activeTab, setActiveTab] = useState<'my' | 'pending' | 'approved'>('my')
+  const [activeTab, setActiveTab] = useState<'my' | 'pending' | 'approved' | 'cc'>('my')
   const [list, setList] = useState<ApprovalItem[]>([])
   const [loading, setLoading] = useState(false)
   const [hasMore, setHasMore] = useState(false)
@@ -179,6 +179,7 @@ export default function ApprovalList() {
         <Tabs.Tab title="我发起的" key="my" />
         <Tabs.Tab title="待我审批" key="pending" />
         <Tabs.Tab title="我已审批" key="approved" />
+        <Tabs.Tab title="抄送我的" key="cc" />
       </Tabs>
 
       <PullToRefresh onRefresh={handleRefresh}>