优化动图

prisma/migrations/20251023021547_add_duration_to_image_file/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "ImageFile" ADD COLUMN     "duration" INTEGER;

prisma/schema.prisma

@@ -144,6 +144,7 @@ model ImageFile {
   height    Int?
 
   animated  String?   // 如果是动图，存储 video 格式的 URL
+  duration  Int?      // 动图时长（毫秒），仅当 animated 不为 null 时有值
 
   createdAt DateTime  @default(now())
   updatedAt DateTime  @updatedAt