feat(#108): Validation dossier famille – POST /parents/:parentId/valider-dossier

- getFamilyUserIds(parentId) : tous les user_id de la famille (co_parent + enfants partagés)
- Valide en une fois tous les comptes en_attente/refuse de la famille (validateUser)
- Réponse : liste des Users validés

Made-with: Cursor

backend/src/routes/parents/parents.service.ts

@@ -119,4 +119,49 @@ export class ParentsService {
       numero_dossier: r.numero_dossier ?? null,
     }));
   }
+
+  /**
+   * Retourne les user_id de tous les parents de la même famille (co_parent ou enfants partagés).
+   * @throws NotFoundException si parentId n'est pas un parent
+   */
+  async getFamilyUserIds(parentId: string): Promise<string[]> {
+    const raw = await this.parentsRepository.query(
+      `
+      WITH RECURSIVE
+      links AS (
+        SELECT p.id_utilisateur AS p1, p.id_co_parent AS p2 FROM parents p WHERE p.id_co_parent IS NOT NULL
+        UNION ALL
+        SELECT p.id_co_parent AS p1, p.id_utilisateur AS p2 FROM parents p WHERE p.id_co_parent IS NOT NULL
+        UNION ALL
+        SELECT ep1.id_parent AS p1, ep2.id_parent AS p2
+        FROM enfants_parents ep1
+        JOIN enfants_parents ep2 ON ep2.id_enfant = ep1.id_enfant AND ep1.id_parent < ep2.id_parent
+        UNION ALL
+        SELECT ep2.id_parent AS p1, ep1.id_parent AS p2
+        FROM enfants_parents ep1
+        JOIN enfants_parents ep2 ON ep2.id_enfant = ep1.id_enfant AND ep1.id_parent < ep2.id_parent
+      ),
+      rec AS (
+        SELECT id_utilisateur AS id, id_utilisateur AS rep FROM parents
+        UNION
+        SELECT l.p2 AS id, LEAST(rec_alias.rep, l.p2) AS rep FROM links l JOIN rec rec_alias ON rec_alias.id = l.p1
+      ),
+      family_rep AS (
+        SELECT id, (MIN(rep::text))::uuid AS rep FROM rec GROUP BY id
+      ),
+      input_rep AS (
+        SELECT rep FROM family_rep WHERE id = $1::uuid LIMIT 1
+      )
+      SELECT fr.id::text AS id
+      FROM family_rep fr
+      CROSS JOIN input_rep ir
+      WHERE fr.rep = ir.rep
+      `,
+      [parentId],
+    );
+    if (!raw || raw.length === 0) {
+      throw new NotFoundException('Parent introuvable ou pas encore enregistré en base.');
+    }
+    return raw.map((r: { id: string }) => r.id);
+  }
 }