fix(admin): support 4-segment version number format (x.y.z.w)

Allow version names like 1.0.0.4 in addition to the standard x.y.z format.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/admin-service/src/api/dto/request/upload-version.dto.ts

@@ -19,7 +19,7 @@ export class UploadVersionDto {
   @ApiPropertyOptional({ description: '版本名称 (可从APK/IPA自动检测)', example: '1.0.0' })
   @IsOptional()
   @IsString()
-  @Matches(/^\d+\.\d+\.\d+$/, { message: 'versionName must be in format x.y.z' })
+  @Matches(/^\d+\.\d+\.\d+(\.\d+)?$/, { message: 'versionName must be in format x.y.z or x.y.z.w' })
   versionName?: string
 
   @ApiPropertyOptional({ description: '构建号 (可从APK/IPA自动检测)', example: '100' })