feat(#168): API couples de garde parent (liste + couple courant).

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

backend/src/entities/parents.entity.ts

@@ -5,6 +5,7 @@ import {
 import { Users } from './users.entity';
 import { ParentsChildren } from './parents_children.entity';
 import { Dossier } from './dossiers.entity';
+import { AmChildren } from './am_children.entity';
 
 @Entity('parents', { schema: 'public' })
 export class Parents {
@@ -25,6 +26,17 @@ export class Parents {
   @Column({ name: 'numero_dossier', length: 20, nullable: true })
   numero_dossier?: string;
 
+  /**
+   * Placement AM↔enfant sélectionné sur le TdB parent (couple actif) — ticket #168.
+   * Null = le front prend le premier couple actif retourné par l’API.
+   */
+  @Column({ name: 'id_placement_garde_courant', type: 'uuid', nullable: true })
+  id_placement_garde_courant?: string | null;
+
+  @ManyToOne(() => AmChildren, { nullable: true, onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'id_placement_garde_courant', referencedColumnName: 'id' })
+  placement_garde_courant?: AmChildren | null;
+
   // Lien vers enfants via la table enfants_parents
   @OneToMany(() => ParentsChildren, pc => pc.parent)
   parentChildren: ParentsChildren[];