feat(#159): suppressions métier dossiers/parents/enfants/AM/staff.

SuppressionService + DELETE /dossiers/:numero, cascades DELETE /users et
DELETE /enfants?deleteDossier, flag sans_enfant, specs front #160.

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

backend/src/routes/user/user.module.ts

@@ -12,6 +12,7 @@ import { Parents } from 'src/entities/parents.entity';
 import { GestionnairesModule } from './gestionnaires/gestionnaires.module';
 import { MailModule } from 'src/modules/mail/mail.module';
 import { AppConfigModule } from 'src/modules/config/config.module';
+import { SuppressionsModule } from '../suppressions/suppressions.module';
 
 @Module({
   imports: [TypeOrmModule.forFeature(
@@ -26,6 +27,7 @@ import { AppConfigModule } from 'src/modules/config/config.module';
     GestionnairesModule,
     MailModule,
     AppConfigModule,
+    SuppressionsModule,
   ],
   controllers: [UserController],
   providers: [UserService],