Release v2.9.0 - iNTERCEPT rebrand and UI overhaul

- Rebrand from INTERCEPT to iNTERCEPT
- New logo design with 'i' and signal wave brackets
- Add animated landing page with "See the Invisible" tagline
- Fix tuning dial audio issues with debouncing and restart prevention
- Fix Listening Post scanner with proper signal hit logging
- Update setup script for apt-based Python package installation
- Add Instagram promo video template
- Add full-size logo assets for external use

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

app.py

@@ -421,6 +421,14 @@ def main() -> None:
     from routes import register_blueprints
     register_blueprints(app)
 
+    # Initialize WebSocket for audio streaming
+    try:
+        from routes.audio_websocket import init_audio_websocket
+        init_audio_websocket(app)
+        print("WebSocket audio streaming enabled")
+    except ImportError as e:
+        print(f"WebSocket audio disabled (install flask-sock): {e}")
+
     print(f"Open http://localhost:{args.port} in your browser")
     print()
     print("Press Ctrl+C to stop")