Merge develop into master (squash)

- feat(#90): API Inscription AM - POST /auth/register/am
- Suppression legacy register/parent/legacy
- BDD assistantes_maternelles alignée entité
- Script test register AM

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

frontend/lib/services/api/api_config.dart

@@ -5,6 +5,8 @@ class ApiConfig {
   // Auth endpoints
   static const String login = '/auth/login';
   static const String register = '/auth/register';
+  static const String registerParent = '/auth/register/parent';
+  static const String registerAM = '/auth/register/am';
   static const String refreshToken = '/auth/refresh';
   static const String authMe = '/auth/me';
   static const String changePasswordRequired = '/auth/change-password-required';