feat(catalog): add product fulfillment flags and auto SKU

Enable online/cross-city/on-site purchase switches with trade gates, HQ and proxy UI, and server-generated DK SKUs.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/dukang-api/src/modules/ops/dto/admin-mutate.dto.ts

@@ -1068,9 +1068,10 @@ export class SaveHqAccountPermissionsDto {
 }
 
 export class CreateProductDto {
+  /** 可选；创建时由服务端自增生成，忽略客户端传入 */
+  @IsOptional()
   @IsString()
-  @IsNotEmpty()
-  skuCode: string;
+  skuCode?: string;
 
   @IsString()
   @IsNotEmpty()
@@ -1110,6 +1111,14 @@ export class CreateProductDto {
   @IsBoolean()
   allowOnSitePickup?: boolean;
 
+  @IsOptional()
+  @IsBoolean()
+  allowOnlinePurchase?: boolean;
+
+  @IsOptional()
+  @IsBoolean()
+  allowCrossCityDelivery?: boolean;
+
   /** 开启后仅白名单手机号在 C 端可见/可购 */
   @IsOptional()
   @IsBoolean()
@@ -1173,6 +1182,14 @@ export class UpdateProductDto {
   @IsBoolean()
   allowOnSitePickup?: boolean;
 
+  @IsOptional()
+  @IsBoolean()
+  allowOnlinePurchase?: boolean;
+
+  @IsOptional()
+  @IsBoolean()
+  allowCrossCityDelivery?: boolean;
+
   /** 开启后仅白名单手机号在 C 端可见/可购 */
   @IsOptional()
   @IsBoolean()