fix(lint): 移除未使用的directUploadMutation，修复前端lint失败

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

@@ -375,29 +375,6 @@ const AssetLibrary: React.FC = () => {
   /* 状态 */
   const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set());
 
-  // 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: unknown) => {
-      if (!(err as { __msgShown?: boolean })?.__msgShown) {
-        const errMsg = err instanceof Error ? err.message : "上传失败";
-        // 显示详细错误信息，方便排查 OSS 问题
-        message.error({
-          content: errMsg,
-          duration: 8, // 8秒，让用户能看清错误详情
-        });
-        console.error("[AssetLibrary] 大文件上传失败:", {
-          error: errMsg,
-          fullError: err,
-        });
-      }
-    },
-  });
 
   /* 筛选 */
   const [searchText, setSearchText] = useState("");