feat(#131): fiches parent/AM éditable, placement AM↔enfant, statuts garde/sans_garde

Squash merge develop → master.

- Fiche parent éditable (co-parent, PATCH fiche, GET /parents)
- Fiche AM 3 onglets (PATCH fiche, rattacher/détacher enfants)
- Table enfants_assistantes_maternelles + enum garde/sans_garde
- Migration SQL + BDD.sql canonique
- Correctifs recette : @Get() parents, DTO fiche AM, fix NIR

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

backend/src/entities/children.entity.ts

@@ -4,12 +4,14 @@ import {
 } from 'typeorm';
 import { Parents } from './parents.entity';
 import { ParentsChildren } from './parents_children.entity';
+import { AmChildren } from './am_children.entity';
 import { Dossier } from './dossiers.entity';
 
 export enum StatutEnfantType {
   A_NAITRE = 'a_naitre',
-  ACTIF = 'actif',
   SCOLARISE = 'scolarise',
+  GARDE = 'garde',
+  SANS_GARDE = 'sans_garde',
 }
 
 export enum GenreType {
@@ -68,6 +70,9 @@ export class Children {
   @OneToMany(() => ParentsChildren, pc => pc.child)
   parentLinks: ParentsChildren[];
 
+  @OneToMany(() => AmChildren, (ac) => ac.child)
+  amLinks: AmChildren[];
+
   // Relation avec Dossier
   @OneToMany(() => Dossier, d => d.child)
   dossiers: Dossier[];