fix: propagate Settings config changes to service managers and live pages

- PUT /api/config now calls service_manager.update_config() for each service
  so changes write to the service's own config file, not just cell_config.json
- email_manager.get_status() now reads smtp_port/imap_port/domain from its
  config file (defaults: 587/993/cell.local) and includes them in the response
- calendar_manager.get_status() includes configured port (default 5232)
- file_manager.get_status() uses configured port from service config
- Email.jsx reads imap_port/smtp_port from API status instead of hardcoding
- Settings service sections show "port changes require container restart" note

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

api/file_manager.py

@@ -481,13 +481,16 @@ umask = 022
             import os
             is_docker = os.path.exists('/.dockerenv') or os.environ.get('DOCKER_CONTAINER') == 'true'
             
+            svc_cfg = self.get_config()
+            configured_port = svc_cfg.get('port', 80) if isinstance(svc_cfg, dict) and 'error' not in svc_cfg else 80
+
             if is_docker:
                 # Check if file container is actually running
                 container_running = self._check_file_container_status()
                 status = {
                     'running': container_running,
                     'status': 'online' if container_running else 'offline',
-                    'webdav_status': {'running': container_running, 'port': 8080},
+                    'webdav_status': {'running': container_running, 'port': configured_port},
                     'users_count': 0,
                     'total_storage_used': {'bytes': 0, 'human_readable': '0 B'},
                     'timestamp': datetime.utcnow().isoformat()