Fix UpdateProfessionalDto: add identification_picture and certificate_picture

These fields were missing from the DTO so NestJS/class-validator was stripping
them from PATCH /professionals/me requests before they reached Prisma.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/professionals/dto/professional.dto.ts

@@ -57,6 +57,14 @@ export class UpdateProfessionalDto {
   @IsNumber()
   rate?: number;
 
+  @IsOptional()
+  @IsString()
+  identification_picture?: string;
+
+  @IsOptional()
+  @IsString()
+  certificate_picture?: string;
+
   @IsOptional()
   @IsString()
   banner_picture?: string;