feat: 多功能更新

prisma/migrations/20260425220000_add_lsky_hosting/migration.sql

@@ -0,0 +1,4 @@
+ALTER TABLE `image_generations`
+  DROP COLUMN `image_base64`,
+  ADD COLUMN `hosted_image_url` VARCHAR(2048) NULL COMMENT 'Lsky 图床归档后的图片 URL' AFTER `image_url`,
+  ADD COLUMN `hosted_response` JSON NULL COMMENT '完整 Lsky 图床上传接口响应' AFTER `upstream_response`;

prisma/schema.prisma

@@ -44,10 +44,11 @@ model ImageGeneration {
   endedAt          DateTime?             @map("ended_at")
   durationMs       Int?                  @map("duration_ms")
   imageUrl         String?               @map("image_url") @db.VarChar(2048)
-  imageBase64      String?               @map("image_base64") @db.LongText
+  hostedImageUrl   String?               @map("hosted_image_url") @db.VarChar(2048)
   imageMimeType    String?               @map("image_mime_type") @db.VarChar(191)
   revisedPrompt    String?               @map("revised_prompt") @db.Text
   upstreamResponse Json?                 @map("upstream_response")
+  hostedResponse   Json?                 @map("hosted_response")
   errorMessage     String?               @map("error_message") @db.Text
   createdAt        DateTime              @default(now()) @map("created_at")
   updatedAt        DateTime              @updatedAt @map("updated_at")