fix(#90): BDD assistantes_maternelles alignée entité + script test curl

- BDD.sql: ville_residence, annee_experience, specialite, date_agrement nullable
- scripts/test-register-am.sh pour tester POST /auth/register/am

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

backend/scripts/test-register-am.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+# Test POST /auth/register/am (ticket #90)
+# Usage: ./scripts/test-register-am.sh [BASE_URL]
+# Exemple: ./scripts/test-register-am.sh https://app.ptits-pas.fr/api/v1
+#          ./scripts/test-register-am.sh http://localhost:3000/api/v1
+
+BASE_URL="${1:-http://localhost:3000/api/v1}"
+echo "Testing POST $BASE_URL/auth/register/am"
+echo "---"
+
+curl -s -w "\n\nHTTP %{http_code}\n" -X POST "$BASE_URL/auth/register/am" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "email": "marie.dupont.test@ptits-pas.fr",
+    "prenom": "Marie",
+    "nom": "DUPONT",
+    "telephone": "0612345678",
+    "adresse": "1 rue Test",
+    "code_postal": "75001",
+    "ville": "Paris",
+    "consentement_photo": true,
+    "nir": "123456789012345",
+    "numero_agrement": "AGR-2024-001",
+    "capacite_accueil": 4,
+    "acceptation_cgu": true,
+    "acceptation_privacy": true
+  }'