v3.5.4 规格主图、门店使用规则与收银台 logo

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

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

@@ -9,6 +9,7 @@ import {
   IsObject,
   IsOptional,
   IsString,
+  MaxLength,
   Min,
   Max,
   MinLength,
@@ -1400,6 +1401,12 @@ class AdminSkuRowDto {
   @IsOptional()
   @IsNumber()
   sortOrder?: number;
+
+  /** 规格主图 URL；空则回落商品封面 */
+  @IsOptional()
+  @IsString()
+  @MaxLength(512)
+  imageUrl?: string | null;
 }
 
 export class SaveProductSkusDto {