feat: 为所有终端添加平台显示功能

- 新增 frontend/lib/platforms.ts 共享平台配置模块
- 支持6个平台: 抖音、小红书、B站、快手、微博、微信视频号
- 品牌方终端: 项目看板、项目详情、终审台列表添加平台显示
- 代理商终端: 工作台概览、审核台、Brief配置、达人管理、
  数据报表、消息中心、申诉处理添加平台显示
- 达人端: 任务列表添加平台显示
- 统一使用彩色头部条样式展示平台信息

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

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

@@ -4,6 +4,7 @@ import { useState } from 'react'
 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'
 
 // 模拟待审核内容列表
 const mockReviewItems = [
@@ -12,6 +13,7 @@ const mockReviewItems = [
     title: '春季护肤新品体验分享',
     creator: '小美',
     agency: '代理商A',
+    platform: 'douyin',
     reviewer: '张三',
     reviewTime: '2小时前',
     agencyOpinion: '内容符合Brief要求，卖点覆盖完整，建议通过。',
@@ -29,6 +31,7 @@ const mockReviewItems = [
     title: '夏日清爽护肤推荐',
     creator: '小红',
     agency: '代理商B',
+    platform: 'xiaohongshu',
     reviewer: '李四',
     reviewTime: '5小时前',
     agencyOpinion: '内容质量良好，但部分镜头略暗，建议后期调整后通过。',
@@ -99,6 +102,7 @@ export default function FinalReviewPage() {
   const [selectedItem, setSelectedItem] = useState(mockReviewItems[0])
   const [feedback, setFeedback] = useState('')
   const [isSubmitting, setIsSubmitting] = useState(false)
+  const platform = getPlatformInfo(selectedItem.platform)
 
   const handleApprove = async () => {
     setIsSubmitting(true)
@@ -122,11 +126,19 @@ export default function FinalReviewPage() {
   }
 
   return (
-    <div className="flex flex-col gap-6 h-full">
+    <div className="flex flex-col gap-6 h-full min-h-0">
       {/* 顶部栏 */}
       <div className="flex items-center justify-between">
         <div className="flex flex-col gap-1">
-          <h1 className="text-2xl font-bold text-text-primary">终审台</h1>
+          <div className="flex items-center gap-3">
+            <h1 className="text-2xl font-bold text-text-primary">终审台</h1>
+            {platform && (
+              <span className={`inline-flex items-center gap-1.5 px-3 py-1 rounded-lg text-sm font-medium ${platform.bgColor} ${platform.textColor} border ${platform.borderColor}`}>
+                <span>{platform.icon}</span>
+                {platform.name}
+              </span>
+            )}
+          </div>
           <p className="text-sm text-text-secondary">
             {selectedItem.title} · 达人: {selectedItem.creator}
           </p>
@@ -167,7 +179,7 @@ export default function FinalReviewPage() {
         </div>
 
         {/* 右侧 - 分析面板 */}
-        <div className="w-[380px] flex flex-col gap-4 overflow-auto">
+        <div className="w-[380px] flex flex-col gap-4 overflow-y-auto overflow-x-hidden">
           {/* 代理商初审意见 */}
           <div className="bg-bg-card rounded-2xl p-5 card-shadow">
             <div className="flex items-center justify-between mb-3">