feat(product-center): implement Figma-designed UI, upload module, and website tests

- Redesign website homepage & product-center per Figma (fonts, logos, hero/footer/customer cases)
- Add API upload module (multer) with static serving for uploads/public assets
- Add OriginGood.delisted flag and SDS request retry logic
- Add admin ImageUpload component and goods import/upload flows
- Add vitest suite for website components and composables (32 tests)
- Add skills, docs, plans and PRODUCT.md

apps/api/src/app.module.ts

@@ -11,6 +11,7 @@ import { OriginGoodsModule } from './origin-goods/origin-goods.module';
 import { GoodsModule } from './goods/goods.module';
 import { SyncModule } from './sync/sync.module';
 import { PublicModule } from './public/public.module';
+import { UploadModule } from './upload/upload.module';
 
 @Module({
   imports: [
@@ -28,6 +29,7 @@ import { PublicModule } from './public/public.module';
     GoodsModule,
     SyncModule,
     PublicModule,
+    UploadModule,
   ],
 })
 export class AppModule {}