feat(product-center): implement full product center with NestJS backend, Vue3 admin, and Nuxt4 website page

- NestJS backend: Prisma + PostgreSQL, JWT auth, CRUD for goods/categories/countries/tags/positions, SDS sync with cron, public API, Swagger docs
- Vue3 Admin: Element Plus, goods/categories/countries/tags/positions/sync management pages, batch operations, login with JWT
- Nuxt4 Website: product-center page with sidebar navigation, country filter, search, product grid, pagination, skeleton loading
- Nitro proxy routes for backend API
- 54 backend tests passing
- Updated docs and README

inkreach-official-nestjs/src/goods/dto/update-good.dto.ts

@@ -0,0 +1,50 @@
+import { ApiProperty } from '@nestjs/swagger';
+import {
+  IsInt,
+  IsOptional,
+  IsString,
+  Min,
+} from 'class-validator';
+
+export class UpdateGoodDto {
+  @ApiProperty({ required: false })
+  @IsOptional()
+  @IsString()
+  goodName?: string;
+
+  @ApiProperty({ required: false })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  originGoodId?: number;
+
+  @ApiProperty({ required: false })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  countryId?: number;
+
+  @ApiProperty({ required: false })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  categoryId?: number;
+
+  @ApiProperty({ required: false, nullable: true })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  tagId?: number | null;
+
+  @ApiProperty({ required: false, nullable: true })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  positionId?: number | null;
+
+  @ApiProperty({ required: false })
+  @IsOptional()
+  @IsInt()
+  @Min(0)
+  goodPriority?: number;
+}