feat(backend): update gestionnaire creation logic and clean up DTOs

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

backend/src/routes/user/dto/create_gestionnaire.dto.ts

@@ -2,7 +2,7 @@ import { ApiProperty, OmitType } from "@nestjs/swagger";
 import { CreateUserDto } from "./create_user.dto";
 import { IsOptional, IsUUID } from "class-validator";
 
-export class CreateGestionnaireDto extends OmitType(CreateUserDto, ['role', 'adresse'] as const) {
+export class CreateGestionnaireDto extends OmitType(CreateUserDto, ['role', 'adresse', 'genre', 'statut', 'situation_familiale', 'ville', 'code_postal', 'photo_url', 'consentement_photo', 'date_consentement_photo', 'changement_mdp_obligatoire'] as const) {
   @ApiProperty({ required: false, description: 'ID du relais de rattachement' })
   @IsOptional()
   @IsUUID()