feat: add Generic OOK Signal Decoder module

New 'OOK Decoder' mode for capturing and decoding arbitrary OOK/ASK
signals using rtl_433's flex decoder with fully configurable pulse
timing. Covers PWM, PPM, and Manchester encoding schemes.

Backend (utils/ook.py, routes/ook.py):
- Configurable modulation: OOK_PWM, OOK_PPM, OOK_MC_ZEROBIT
- Full rtl_433 flex spec builder with user-supplied pulse timings
- Bit-inversion fallback for transmitters with swapped short/long mapping
- Optional frame deduplication for repeated transmissions
- SSE streaming via /ook/stream

Frontend (static/js/modes/ook.js, templates/partials/modes/ook.html):
- Live MSB/LSB bit-order toggle — re-renders all stored frames instantly
  without restarting the decoder
- Full-detail frame display: timestamp, bit count, hex, dotted ASCII
- Modulation selector buttons with encoding hint text
- Full timing grid: short, long, gap/reset, tolerance, min bits
- CSV export of captured frames
- Global SDR device panel injection (device, SDR type, rtl_tcp, bias-T)

Integration (app.py, routes/__init__.py, templates/):
- Globals: ook_process, ook_queue, ook_lock
- Registered blueprint, nav entries (desktop + mobile), welcome card
- ookOutputPanel in visuals area with bit-order toolbar

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

routes/__init__.py

@@ -18,6 +18,7 @@ def register_blueprints(app):
     from .meshtastic import meshtastic_bp
     from .meteor_websocket import meteor_bp
     from .morse import morse_bp
+    from .ook import ook_bp
     from .offline import offline_bp
     from .pager import pager_bp
     from .radiosonde import radiosonde_bp
@@ -81,6 +82,7 @@ def register_blueprints(app):
     app.register_blueprint(morse_bp)  # CW/Morse code decoder
     app.register_blueprint(radiosonde_bp)  # Radiosonde weather balloon tracking
     app.register_blueprint(system_bp)  # System health monitoring
+    app.register_blueprint(ook_bp)  # Generic OOK signal decoder
 
     # Initialize TSCM state with queue and lock from app
     import app as app_module