feat(assets): add 2GB file size validation and OSS direct upload for large files

- Add MAX_FILE_SIZE (2GB) validation in handleUpload with friendly error message
- Route files >100MB through OSS presigned direct upload (uploadAssetDirect)
- Keep small file form upload (uploadAsset) for files <=100MB
- Update upload hint text to show '单文件不超过 2GB' limit
- Add directUploadMutation with proper loading state tracking

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/web/src/pages/assets/AssetLibrary.tsx

@@ -37,12 +37,18 @@ import {
   getAssets,
   deleteAsset,
   uploadAsset,
+  uploadAssetDirect,
 } from '@/api/assets';
 import { getOrCreateDefaultProject } from '@/api/projects';
 
 const { Title, Text } = Typography;
 const { Dragger } = Upload;
 
+/** 最大文件大小：2GB */
+const MAX_FILE_SIZE = 2 * 1024 * 1024 * 1024; // 2147483648 bytes
+/** 大文件阈值：100MB，超过此值走 OSS 直传通道 */
+const LARGE_FILE_THRESHOLD = 100 * 1024 * 1024; // 104857600 bytes
+
 /** 素材库类型图标 */
 const KindIcon: React.FC<{ kind: string }> = ({ kind }) => {
   switch (kind) {
@@ -99,7 +105,7 @@ const AssetLibrary: React.FC = () => {
     onError: (err: any) => { if (!err?.__msgShown) message.error('创建失败') },
   });
 
-  // 上传素材
+  // 上传素材（小文件表单上传）
   const uploadMutation = useMutation({
     mutationFn: uploadAsset,
     onSuccess: () => {
@@ -110,6 +116,17 @@ const AssetLibrary: React.FC = () => {
     onError: (err: any) => { if (!err?.__msgShown) message.error('上传失败') },
   });
 
+  // 大文件直传（OSS 预签名）
+  const directUploadMutation = useMutation({
+    mutationFn: uploadAssetDirect,
+    onSuccess: () => {
+      message.success('上传成功');
+      queryClient.invalidateQueries({ queryKey: ['assets', activeLibrary] });
+      queryClient.invalidateQueries({ queryKey: ['asset-libraries'] });
+    },
+    onError: (err: any) => { if (!err?.__msgShown) message.error('上传失败') },
+  });
+
   // 删除素材
   const deleteMutation = useMutation({
     mutationFn: deleteAsset,
@@ -127,16 +144,32 @@ const AssetLibrary: React.FC = () => {
       message.warning('请先选择素材库');
       return false;
     }
+
+    // 文件大小校验：上限 2GB
+    if (file.size > MAX_FILE_SIZE) {
+      message.error('文件大小不能超过 2GB');
+      return false;
+    }
+
     setUploading(true);
     try {
-      const project = await getOrCreateDefaultProject();
-      const formData = new FormData();
-      formData.append('file', file);
-      formData.append('library_id', activeLibrary);
-      formData.append('project_id', project.id);
-      await uploadMutation.mutateAsync(formData);
+      if (file.size > LARGE_FILE_THRESHOLD) {
+        // 大文件（>100MB）走 OSS 预签名直传通道
+        await directUploadMutation.mutateAsync({
+          file,
+          library_id: activeLibrary,
+        });
+      } else {
+        // 小文件走表单上传
+        const project = await getOrCreateDefaultProject();
+        const formData = new FormData();
+        formData.append('file', file);
+        formData.append('library_id', activeLibrary);
+        formData.append('project_id', project.id);
+        await uploadMutation.mutateAsync(formData);
+      }
     } catch {
-      // uploadMutation.onError 已处理错误提示
+      // mutation.onError 已处理错误提示
     } finally {
       setUploading(false);
     }
@@ -216,7 +249,7 @@ const AssetLibrary: React.FC = () => {
               beforeUpload={handleUpload}
               showUploadList={false}
               multiple
-              disabled={uploading || uploadMutation.isPending}
+              disabled={uploading || uploadMutation.isPending || directUploadMutation.isPending}
               style={{ marginBottom: 24 }}
             >
               <p className="ant-upload-drag-icon">
@@ -226,7 +259,7 @@ const AssetLibrary: React.FC = () => {
                 {uploading ? '正在上传，请稍候...' : '点击或拖拽文件到此区域上传'}
               </p>
               <p className="ant-upload-hint">
-                支持 {kindLabel[currentLib?.kind || 'video']} 格式文件
+                支持 {kindLabel[currentLib?.kind || 'video']} 格式文件，单文件不超过 2GB
               </p>
             </Dragger>
           )}