feat(card): 构建全球6大赛道高保真Demo数据并完成线上数据库与服务部署

backend/src/modules/card/entity/cases.ts

@@ -1,4 +1,4 @@
-import { BaseEntity } from '../../base/entity/base';
+import { BaseEntity, transformerJson } from '../../base/entity/base';
 import { Column, Entity, Index } from 'typeorm';
 import type { CardCase } from '../../../comm/types/omni';
 
@@ -71,6 +71,15 @@ export class CardCasesEntity extends BaseEntity implements CardCase {
   })
   description: string;
 
+  @Column({
+    name: 'meta_json',
+    comment: '扩展元数据 JSON (包含 images 相册图片数组、kpis 量化指标等)',
+    type: 'json',
+    nullable: true,
+    transformer: transformerJson,
+  })
+  metaJson?: Record<string, unknown> | string;
+
   @Index()
   @Column({
     name: 'sort_order',