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/dossiers/dossiers.service.ts

@@ -5,12 +5,13 @@ import { Parents } from 'src/entities/parents.entity';
 import { AssistanteMaternelle } from 'src/entities/assistantes_maternelles.entity';
 import { StatutUtilisateurType, Users } from 'src/entities/users.entity';
 import { ParentsService } from '../parents/parents.service';
+import { SuppressionService } from '../suppressions/suppression.service';
 import { DossierUnifieDto } from './dto/dossier-unifie.dto';
 import { DossierAmCompletDto, DossierAmUserDto } from './dto/dossier-am-complet.dto';
 import { DossierListItemDto } from './dto/dossier-list-item.dto';
 
 /**
- * Dossiers unifiés — détail (#119) + liste (#153).
+ * Dossiers unifiés — détail (#119) + liste (#153) + sans_enfant (#159).
  */
 @Injectable()
 export class DossiersService {
@@ -20,6 +21,7 @@ export class DossiersService {
     @InjectRepository(AssistanteMaternelle)
     private readonly amRepository: Repository<AssistanteMaternelle>,
     private readonly parentsService: ParentsService,
+    private readonly suppressionService: SuppressionService,
   ) {}
 
   /**
@@ -43,6 +45,17 @@ export class DossiersService {
       return b.numero_dossier.localeCompare(a.numero_dossier, 'fr');
     });
 
+    for (const item of filtered) {
+      if (item.type === 'famille') {
+        const n = await this.suppressionService.countEnfantsForNumero(
+          item.numero_dossier,
+        );
+        item.sans_enfant = n === 0;
+      } else {
+        item.sans_enfant = false;
+      }
+    }
+
     return filtered;
   }