Add APRS amateur radio tracking feature

- Create routes/aprs.py with start/stop/stream endpoints for APRS decoding
- Support multiple regional frequencies (North America, Europe, Australia, etc.)
- Use direwolf (preferred) or multimon-ng as AFSK1200 decoder
- Parse APRS packets for position, weather, messages, and telemetry
- Add APRS visualization panel with Leaflet map and station tracking
- Include station list with callsigns, distance, and last heard time
- Add packet log with raw APRS data display
- Register APRS blueprint and add global state management
- Add direwolf and multimon-ng to dependency definitions

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

routes/__init__.py

@@ -8,6 +8,7 @@ def register_blueprints(app):
     from .bluetooth import bluetooth_bp
     from .adsb import adsb_bp
     from .acars import acars_bp
+    from .aprs import aprs_bp
     from .satellite import satellite_bp
     from .gps import gps_bp
     from .settings import settings_bp
@@ -20,6 +21,7 @@ def register_blueprints(app):
     app.register_blueprint(bluetooth_bp)
     app.register_blueprint(adsb_bp)
     app.register_blueprint(acars_bp)
+    app.register_blueprint(aprs_bp)
     app.register_blueprint(satellite_bp)
     app.register_blueprint(gps_bp)
     app.register_blueprint(settings_bp)