feat(permissions) : add role-based access control system

Backend:
- Add role hierarchy (ADMIN > GESTIONNAIRE > VIEWER > USER) in security.yaml
- Add password authentication on profile activation (SessionProfileController)
- Add SessionProfileAuthenticator with stateless API firewall
- Add ProfilePasswordHasher state processor for API Platform
- Add security annotations on all 18 API Platform entities
- Add denyAccessUnlessGranted on all 13 custom controllers
- Add AdminProfileController for profile/role management (/api/admin/profiles)
- Add InitProfilePasswordsCommand for initial admin setup
- Simplify SessionProfilesController to list-only (removed create/delete)

Frontend (submodule update):
- Add usePermissions composable (isAdmin, canEdit, canView, isGranted)
- Add password login modal on profiles page
- Add admin backoffice page for profile management
- Disable all form fields for ROLE_VIEWER across all edit/create pages
- Show navigation buttons for all roles, hide destructive actions for viewers
- Add readonly mode to ModelTypeForm and site/constructeur modals
- Guard /admin routes in middleware
- Configure Vite proxy for API requests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Controller/MachineCustomFieldsController.php

@@ -26,6 +26,8 @@ class MachineCustomFieldsController extends AbstractController
     #[Route('/{id}/add-custom-fields', name: 'machine_add_custom_fields', methods: ['POST'])]
     public function addMissingCustomFields(string $id): JsonResponse
     {
+        $this->denyAccessUnlessGranted('ROLE_GESTIONNAIRE');
+
         $machine = $this->machineRepository->find($id);
         if (!$machine instanceof Machine) {
             return $this->json(['success' => false, 'error' => 'Machine not found.'], 404);