fix: 修复前端代码质量问题

- 创建 Toast 通知组件，替换所有 alert() 调用
- 修复 useReview hook 内存泄漏（setInterval 清理）
- 移除所有 console.error 和 console.log 语句
- 为复制操作失败添加用户友好的 toast 提示

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/app/brand/final-review/page.tsx

@@ -5,6 +5,7 @@ import { useRouter } from 'next/navigation'
 import { ArrowLeft, Check, X, CheckSquare, Video, Clock } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { getPlatformInfo } from '@/lib/platforms'
+import { useToast } from '@/components/ui/Toast'
 
 // 模拟待审核内容列表
 const mockReviewItems = [
@@ -99,6 +100,7 @@ function ReviewProgressBar({ currentStep }: { currentStep: number }) {
 
 export default function FinalReviewPage() {
   const router = useRouter()
+  const toast = useToast()
   const [selectedItem, setSelectedItem] = useState(mockReviewItems[0])
   const [feedback, setFeedback] = useState('')
   const [isSubmitting, setIsSubmitting] = useState(false)
@@ -108,19 +110,19 @@ export default function FinalReviewPage() {
     setIsSubmitting(true)
     // 模拟提交
     await new Promise(resolve => setTimeout(resolve, 1000))
-    alert('已通过审核')
+    toast.success('已通过审核')
     setIsSubmitting(false)
   }
 
   const handleReject = async () => {
     if (!feedback.trim()) {
-      alert('请填写驳回原因')
+      toast.error('请填写驳回原因')
       return
     }
     setIsSubmitting(true)
     // 模拟提交
     await new Promise(resolve => setTimeout(resolve, 1000))
-    alert('已驳回')
+    toast.success('已驳回')
     setIsSubmitting(false)
     setFeedback('')
   }