fix: TypeScript build errors — unused imports, unknown types

- Remove unused imports from AiGateway (Space, EditOutlined, etc.)
- Add type annotations in Events page (batch retry, failed jobs)

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

src/pages/AiGateway.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react'
 import { useQuery, useQueryClient, useMutation } from '@tanstack/react-query'
-import { Card, Row, Col, Statistic, Table, Tag, Button, Typography, Tabs, Modal, Form, Input, InputNumber, Select, Switch, Space, App } from 'antd'
-import { ReloadOutlined, CloudOutlined, PlusOutlined, EditOutlined, DeleteOutlined, StopOutlined, CheckCircleOutlined } from '@ant-design/icons'
+import { Card, Row, Col, Statistic, Table, Tag, Button, Typography, Tabs, Modal, Form, Input, InputNumber, Select, Switch, App } from 'antd'
+import { ReloadOutlined, CloudOutlined, PlusOutlined, DeleteOutlined } from '@ant-design/icons'
 import { api } from '@/services/http-client'
 
 const { Title, Text } = Typography

src/pages/Events.tsx

@@ -33,7 +33,7 @@ function EventsPage() {
 
   const { data: failed } = useQuery({
     queryKey: ['events', 'failed', selectedQueue],
-    queryFn: () => selectedQueue ? api.get(`/admin-api/events/${selectedQueue}/failed`) : null,
+    queryFn: (): Promise<any> => selectedQueue ? api.get(`/admin-api/events/${selectedQueue}/failed`) : Promise.resolve(null),
     enabled: !!selectedQueue,
   })
 
@@ -44,8 +44,8 @@ function EventsPage() {
   }
 
   const handleBatchRetry = async (queue: string) => {
-    const res = await api.post(`/admin-api/events/${queue}/jobs/batch-retry`, { count: 50 })
-    message.success(`批量重试完成: ${res.data?.retried || 0}/${res.data?.total || 0}`)
+    const res: any = await api.post(`/admin-api/events/${queue}/jobs/batch-retry`, { count: 50 })
+    message.success(`批量重试完成: ${res?.data?.retried || 0}/${res?.data?.total || 0}`)
     qc.invalidateQueries({ queryKey: ['events'] })
   }