refactor: replace any with proper types in admin page api calls

- Add CacheStats, NotificationTemplate, NotificationLog, ReviewCardItem to types/api.ts
- Use PaginatedResult<T> for ReviewAdmin pagination
- All queryFn now declare explicit Promise<T> return type

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/pages/CacheAdmin.tsx

@@ -2,6 +2,7 @@ import { Card, Button, Statistic, Row, Col, Space, Typography, message } from 'a
 import { ClearOutlined, ReloadOutlined, DeleteOutlined } from '@ant-design/icons'
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { api } from '@/services/http-client'
+import type { CacheStats } from '@/types/api'
 
 const { Title } = Typography
 
@@ -10,7 +11,7 @@ export default function CacheAdmin() {
 
   const { data: stats, isLoading } = useQuery({
     queryKey: ['admin', 'cache-stats'],
-    queryFn: () => api.get<any>('/admin-api/cache/stats'),
+    queryFn: (): Promise<CacheStats> => api.get('/admin-api/cache/stats'),
     refetchInterval: 10_000,
   })
 

src/pages/NotificationAdmin.tsx

@@ -3,6 +3,7 @@ import { Card, Table, Button, Modal, Form, Input, Select, Tag, Space, Typography
 import { PlusOutlined, DeleteOutlined, EditOutlined } from '@ant-design/icons'
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { api } from '@/services/http-client'
+import type { NotificationTemplate, NotificationLog } from '@/types/api'
 
 const { Title } = Typography
 
@@ -18,12 +19,14 @@ export default function NotificationAdmin() {
 
   const { data: templates, isLoading } = useQuery({
     queryKey: ['admin', 'notification-templates'],
-    queryFn: () => api.get<any[]>('/admin-api/notifications/templates').then(d => d ?? []),
+    queryFn: (): Promise<NotificationTemplate[]> =>
+      api.get('/admin-api/notifications/templates').then((d: NotificationTemplate[]) => d ?? []),
   })
 
   const { data: sendLogs } = useQuery({
     queryKey: ['admin', 'notification-logs'],
-    queryFn: () => api.get<any[]>('/admin-api/notifications/send-log?limit=50').then(d => d ?? []),
+    queryFn: (): Promise<NotificationLog[]> =>
+      api.get('/admin-api/notifications/send-log?limit=50').then((d: NotificationLog[]) => d ?? []),
   })
 
   const saveMutation = useMutation({

src/pages/ReviewAdmin.tsx

@@ -3,6 +3,7 @@ import { Table, Tag, Space, Input, Select, Typography } from 'antd'
 import { SearchOutlined } from '@ant-design/icons'
 import { useQuery } from '@tanstack/react-query'
 import { api } from '@/services/http-client'
+import type { ReviewCardItem, PaginatedResult } from '@/types/api'
 
 const { Title } = Typography
 
@@ -16,11 +17,11 @@ export default function ReviewAdmin() {
 
   const { data, isLoading } = useQuery({
     queryKey: ['admin', 'reviews', search, statusFilter],
-    queryFn: () => {
+    queryFn: (): Promise<PaginatedResult<ReviewCardItem>> => {
       const params = new URLSearchParams()
       if (search) params.set('search', search)
       if (statusFilter) params.set('status', statusFilter)
-      return api.get<any>(`/admin-api/reviews?${params.toString()}`)
+      return api.get(`/admin-api/reviews?${params.toString()}`)
     },
     refetchInterval: 30_000,
   })

src/types/api.ts

@@ -12,3 +12,45 @@ export interface PaginationParams {
   sortBy?: string
   sortOrder?: 'asc' | 'desc'
 }
+
+export interface CacheStats {
+  hits: number
+  misses: number
+  hitRate: number
+  available: boolean
+}
+
+export interface NotificationTemplate {
+  id: string
+  name: string
+  type: string
+  title: string
+  content: string
+  channel: string
+  enabled: boolean
+  createdBy?: string
+  createdAt: string
+  updatedAt: string
+}
+
+export interface NotificationLog {
+  id: string
+  userId: string
+  type: string
+  title: string
+  readAt: string | null
+  createdAt: string
+}
+
+export interface ReviewCardItem {
+  id: string
+  userId: string
+  frontText: string
+  difficulty: string | null
+  status: string
+  scheduleState: string | null
+  intervalDays: number
+  repetitionCount: number
+  lapseCount: number
+  nextReviewAt: string | null
+}