Add CW/Morse code decoder mode

New signal mode for decoding Morse code (CW) transmissions via SDR.
Includes route blueprint, utility decoder, frontend UI, and tests.

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

routes/__init__.py

@@ -16,6 +16,7 @@ def register_blueprints(app):
     from .gps import gps_bp
     from .listening_post import receiver_bp
     from .meshtastic import meshtastic_bp
+    from .morse import morse_bp
     from .offline import offline_bp
     from .pager import pager_bp
     from .recordings import recordings_bp
@@ -73,6 +74,7 @@ def register_blueprints(app):
     app.register_blueprint(space_weather_bp)  # Space weather monitoring
     app.register_blueprint(signalid_bp)  # External signal ID enrichment
     app.register_blueprint(wefax_bp)  # WeFax HF weather fax decoder
+    app.register_blueprint(morse_bp)  # CW/Morse code decoder
 
     # Initialize TSCM state with queue and lock from app
     import app as app_module