feat: Brief附件/项目平台/规则AI解析/消息中心修复 + 项目创建通知

- Brief 支持代理商附件上传 (迁移 007)
- 项目新增 platform 字段 (迁移 008)，前端创建/展示平台信息
- 修复 AI 规则解析：处理中文引号导致 JSON 解析失败的问题
- 修复消息中心崩溃：补全后端消息类型映射 + fallback 保护
- 项目创建时自动发送消息通知
- .gitignore 排除 backend/data/ 数据库文件

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/app/brand/rules/page.tsx

@@ -8,7 +8,7 @@ import { Modal } from '@/components/ui/Modal'
 import { useToast } from '@/components/ui/Toast'
 import { api } from '@/lib/api'
 import { USE_MOCK } from '@/contexts/AuthContext'
-import { useOSSUpload } from '@/hooks/useOSSUpload'
+// upload via api.proxyUpload directly
 import type {
   ForbiddenWordResponse,
   CompetitorResponse,
@@ -192,7 +192,8 @@ function ListSkeleton({ count = 3 }: { count?: number }) {
 export default function RulesPage() {
   const toast = useToast()
   const fileInputRef = useRef<HTMLInputElement>(null)
-  const { upload: ossUpload, isUploading: isOssUploading, progress: ossProgress } = useOSSUpload('rules')
+  const [isOssUploading, setIsOssUploading] = useState(false)
+  const [ossProgress, setOssProgress] = useState(0)
 
   // Tab 选择
   const [activeTab, setActiveTab] = useState<'platforms' | 'forbidden' | 'competitors' | 'whitelist'>('platforms')
@@ -337,8 +338,14 @@ export default function RulesPage() {
         return
       }
 
-      // 真实模式: 上传到 TOS
-      const uploadResult = await ossUpload(uploadFile)
+      // 真实模式: 上传到 TOS (通过后端代理)
+      setIsOssUploading(true)
+      setOssProgress(0)
+      const uploadResult = await api.proxyUpload(uploadFile, 'rules', (pct) => {
+        setOssProgress(Math.min(95, Math.round(pct * 0.95)))
+      })
+      setOssProgress(100)
+      setIsOssUploading(false)
       documentUrl = uploadResult.url
 
       // 调用 AI 解析
@@ -374,6 +381,7 @@ export default function RulesPage() {
       toast.error('文档解析失败：' + (err instanceof Error ? err.message : '未知错误'))
     } finally {
       setParsing(false)
+      setIsOssUploading(false)
     }
   }