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/creator/task/[id]/script/page.tsx

@@ -16,7 +16,6 @@ import { Modal } from '@/components/ui/Modal'
 import { api } from '@/lib/api'
 import { USE_MOCK } from '@/contexts/AuthContext'
 import { useSSE } from '@/contexts/SSEContext'
-import { useOSSUpload } from '@/hooks/useOSSUpload'
 import type { TaskResponse, AIReviewResult } from '@/types/task'
 import type { BriefResponse } from '@/types/brief'
 
@@ -217,64 +216,109 @@ function AgencyBriefSection({ toast, briefData }: { toast: ReturnType<typeof use
 
 function UploadSection({ taskId, onUploaded }: { taskId: string; onUploaded: () => void }) {
   const [file, setFile] = useState<File | null>(null)
-  const { upload, isUploading, progress } = useOSSUpload('script')
+  const [isUploading, setIsUploading] = useState(false)
+  const [progress, setProgress] = useState(0)
+  const [uploadError, setUploadError] = useState<string | null>(null)
   const toast = useToast()
 
   const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
     const selectedFile = e.target.files?.[0]
-    if (selectedFile) setFile(selectedFile)
+    if (selectedFile) {
+      setFile(selectedFile)
+      setUploadError(null)
+    }
   }
 
   const handleSubmit = async () => {
     if (!file) return
+    setIsUploading(true)
+    setProgress(0)
+    setUploadError(null)
     try {
-      const result = await upload(file)
-      if (!USE_MOCK) {
+      if (USE_MOCK) {
+        for (let i = 0; i <= 100; i += 20) {
+          await new Promise(r => setTimeout(r, 400))
+          setProgress(i)
+        }
+        toast.success('脚本已提交，等待 AI 审核')
+        onUploaded()
+      } else {
+        const result = await api.proxyUpload(file, 'script', (pct) => {
+          setProgress(Math.min(90, Math.round(pct * 0.9)))
+        })
+        setProgress(95)
         await api.uploadTaskScript(taskId, { file_url: result.url, file_name: result.file_name })
+        setProgress(100)
+        toast.success('脚本已提交，等待 AI 审核')
+        onUploaded()
       }
-      toast.success('脚本已提交，等待 AI 审核')
-      onUploaded()
     } catch (err) {
-      toast.error(err instanceof Error ? err.message : '上传失败')
+      const msg = err instanceof Error ? err.message : '上传失败'
+      setUploadError(msg)
+      toast.error(msg)
+    } finally {
+      setIsUploading(false)
     }
   }
 
+  const formatSize = (bytes: number) => {
+    if (bytes < 1024) return bytes + 'B'
+    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + 'KB'
+    return (bytes / (1024 * 1024)).toFixed(1) + 'MB'
+  }
+
   return (
     <Card>
       <CardHeader><CardTitle className="flex items-center gap-2"><Upload size={18} className="text-accent-indigo" />上传脚本</CardTitle></CardHeader>
       <CardContent className="space-y-4">
-        <div className="border-2 border-dashed border-border-subtle rounded-lg p-8 text-center hover:border-accent-indigo/50 transition-colors">
-          {file ? (
-            <div className="space-y-4">
-              <div className="flex items-center justify-center gap-3">
-                <FileText size={24} className="text-accent-indigo" />
-                <span className="text-text-primary">{file.name}</span>
+        {!file ? (
+          <label className="border-2 border-dashed border-border-subtle rounded-lg p-8 text-center hover:border-accent-indigo/50 transition-colors cursor-pointer block">
+            <Upload size={32} className="mx-auto text-text-tertiary mb-3" />
+            <p className="text-text-secondary mb-1">点击上传脚本文件</p>
+            <p className="text-xs text-text-tertiary">支持 Word、PDF、TXT 格式</p>
+            <input type="file" accept=".doc,.docx,.pdf,.txt" onChange={handleFileChange} className="hidden" />
+          </label>
+        ) : (
+          <div className="border border-border-subtle rounded-lg overflow-hidden">
+            <div className="px-4 py-2.5 bg-bg-elevated border-b border-border-subtle">
+              <span className="text-xs font-medium text-text-secondary">已选文件</span>
+            </div>
+            <div className="px-4 py-3">
+              <div className="flex items-center gap-3">
+                {isUploading ? (
+                  <Loader2 size={16} className="animate-spin text-accent-indigo flex-shrink-0" />
+                ) : uploadError ? (
+                  <AlertTriangle size={16} className="text-accent-coral flex-shrink-0" />
+                ) : (
+                  <CheckCircle size={16} className="text-accent-green flex-shrink-0" />
+                )}
+                <FileText size={14} className="text-accent-indigo flex-shrink-0" />
+                <span className="flex-1 text-sm text-text-primary truncate">{file.name}</span>
+                <span className="text-xs text-text-tertiary">{formatSize(file.size)}</span>
                 {!isUploading && (
-                  <button type="button" onClick={() => setFile(null)} className="p-1 hover:bg-bg-elevated rounded-full">
-                    <XCircle size={16} className="text-text-tertiary" />
+                  <button type="button" onClick={() => { setFile(null); setUploadError(null) }} className="p-1 hover:bg-bg-elevated rounded">
+                    <XCircle size={14} className="text-text-tertiary" />
                   </button>
                 )}
               </div>
               {isUploading && (
-                <div className="w-full max-w-xs mx-auto">
-                  <div className="h-2 bg-bg-elevated rounded-full overflow-hidden mb-2">
-                    <div className="h-full bg-accent-indigo transition-all" style={{ width: `${progress}%` }} />
-                  </div>
-                  <p className="text-sm text-text-tertiary">上传中 {progress}%</p>
+                <div className="mt-2 ml-[30px] h-2 bg-bg-page rounded-full overflow-hidden">
+                  <div className="h-full bg-accent-indigo rounded-full transition-all duration-300" style={{ width: `${progress}%` }} />
                 </div>
               )}
+              {isUploading && (
+                <p className="mt-1 ml-[30px] text-xs text-text-tertiary">上传中 {progress}%</p>
+              )}
+              {uploadError && (
+                <p className="mt-1 ml-[30px] text-xs text-accent-coral">{uploadError}</p>
+              )}
             </div>
-          ) : (
-            <label className="cursor-pointer">
-              <Upload size={32} className="mx-auto text-text-tertiary mb-3" />
-              <p className="text-text-secondary mb-1">点击或拖拽上传脚本文件</p>
-              <p className="text-xs text-text-tertiary">支持 Word、PDF、TXT 格式</p>
-              <input type="file" accept=".doc,.docx,.pdf,.txt" onChange={handleFileChange} className="hidden" />
-            </label>
-          )}
-        </div>
+          </div>
+        )}
         <Button onClick={handleSubmit} disabled={!file || isUploading} fullWidth>
-          {isUploading ? '上传中...' : '提交脚本'}
+          {isUploading ? (
+            <><Loader2 size={16} className="animate-spin" />上传中 {progress}%</>
+          ) : '提交脚本'}
         </Button>
       </CardContent>
     </Card>