feat(v3.4.15): HQ store media edit and package images up to 20

Allow HQ to replace/delete store photos; support multi-image packages with a 20-image cap.

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

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

@@ -1,5 +1,6 @@
 import { Type } from 'class-transformer';
 import {
+  ArrayMaxSize,
   IsArray,
   IsBoolean,
   IsIn,
@@ -96,6 +97,7 @@ export class CreateStoreDto {
   @IsOptional()
   @IsArray()
   @IsString({ each: true })
+  @ArrayMaxSize(20)
   envPhotoUrls?: string[];
 
   @IsOptional()
@@ -164,7 +166,17 @@ export class UpdateStoreDto {
 
   @IsOptional()
   @IsString()
-  coverUrl?: string;
+  coverUrl?: string | null;
+
+  @IsOptional()
+  @IsArray()
+  @IsString({ each: true })
+  @ArrayMaxSize(20)
+  envPhotoUrls?: string[];
+
+  @IsOptional()
+  @IsString()
+  contractUrl?: string | null;
 
   @IsOptional()
   @IsString()