refactor(api): migrate expression-api to ApiResponse pattern

- Migrated all 11 functions in expression-api.ts to return Promise<ApiResponse<T>>
- Implemented manual response handling following person-api pattern
- Properly unwrap nested API responses and re-wrap in ApiResponse
- Updated all 16 call sites across 4 files with proper error handling
- Fixed type annotations (ChatInfo) in expression.tsx
- Build passes successfully with no TypeScript errors
- Follows AGENTS.md import conventions and Wave 2 constraints
- All HTTP and API-level errors handled consistently via ApiResponse

dashboard/src/routes/index.tsx

@@ -161,9 +161,9 @@ function IndexPageContent() {
   // 获取审核统计
   const fetchReviewStats = useCallback(async () => {
     try {
-      const data = await getReviewStats()
-      if (isMountedRef.current) {
-        setUncheckedCount(data.unchecked)
+      const result = await getReviewStats()
+      if (result.success && isMountedRef.current) {
+        setUncheckedCount(result.data.unchecked)
       }
     } catch (error) {
       console.error('获取审核统计失败:', error)