feat: add remote device settings portal and Pi hot reload

- add /settings/device portal page and portal device-config GET endpoint
- add portal navigation and client-side device settings editor UI
- hot-reload Account/Car display config after local saves and server syncs
- document portal workflow and Phase 25.5b completion
- add runtime reload tests for account, car, and sync callback

Co-authored-by: Copilot <[email protected]>

modules/app_car.py

@@ -1,15 +1,22 @@
 import json
 import os
 
+
 class Car:
     def __init__(self):
-        # Load from config/device.json at startup
-        # Database values are updated via Settings UI, but Car object reflects startup state
         config = self._load_config()
         self.model = config.get("car_model", "Yaris 2013")
         self.device_name = config.get("device_name", "Yaris OBD")
         self.obd = None
-    
+
+    def reload_runtime_config(self):
+        """Refresh display-facing fields from the live device config store."""
+        from . import app_device_config
+
+        config = app_device_config.get_device_config()
+        self.model = config.get("car_model", "Yaris 2013")
+        self.device_name = config.get("device_name", "Yaris OBD")
+
     def _load_config(self):
         """Load device config from JSON file, return dict with defaults."""
         config_path = os.path.join(os.path.dirname(os.path.dirname(__file__)), "config", "device.json")