Add LoRa/ISM band monitoring mode

- Add new LoRa backend route (routes/lora.py) with:
  - Frequency band definitions (EU868, US915, AU915, AS923, IN865, ISM433)
  - Start/stop/stream/status endpoints using rtl_433
  - Device pattern matching for LoRa/LPWAN devices
  - Signal quality calculation from RSSI

- Add LoRa frontend UI with:
  - Navigation button in SDR/RF group
  - Band selector with channel presets
  - Visualization layout (radar, device types, signal quality, activity log)
  - Device card list with selection details
  - Header stats for devices and signals

- Fix Bias-T toggle visibility for Listening Post and LoRa modes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

routes/__init__.py

@@ -12,6 +12,7 @@ def register_blueprints(app):
     from .settings import settings_bp
     from .correlation import correlation_bp
     from .listening_post import listening_post_bp
+    from .lora import lora_bp
 
     app.register_blueprint(pager_bp)
     app.register_blueprint(sensor_bp)
@@ -23,3 +24,4 @@ def register_blueprints(app):
     app.register_blueprint(settings_bp)
     app.register_blueprint(correlation_bp)
     app.register_blueprint(listening_post_bp)
+    app.register_blueprint(lora_bp)