chore: commit all changes and remove large IQ captures from tracking

Add .gitignore entry for data/subghz/captures/ to prevent large
IQ recording files from being committed.

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

routes/audio_websocket.py

@@ -37,11 +37,17 @@ def find_rtl_fm():
     return shutil.which('rtl_fm')
 
 
-def find_ffmpeg():
-    return shutil.which('ffmpeg')
-
-
-def kill_audio_processes():
+def find_ffmpeg():
+    return shutil.which('ffmpeg')
+
+
+def _rtl_fm_demod_mode(modulation):
+    """Map UI modulation names to rtl_fm demod tokens."""
+    mod = str(modulation or '').lower().strip()
+    return 'wbfm' if mod == 'wfm' else mod
+
+
+def kill_audio_processes():
     """Kill any running audio processes."""
     global audio_process, rtl_process
 
@@ -104,14 +110,14 @@ def start_audio_stream(config):
 
     freq_hz = int(freq * 1e6)
 
-    rtl_cmd = [
-        rtl_fm,
-        '-M', mod,
-        '-f', str(freq_hz),
-        '-s', str(sample_rate),
-        '-r', str(resample_rate),
-        '-g', str(gain),
-        '-d', str(device),
+    rtl_cmd = [
+        rtl_fm,
+        '-M', _rtl_fm_demod_mode(mod),
+        '-f', str(freq_hz),
+        '-s', str(sample_rate),
+        '-r', str(resample_rate),
+        '-g', str(gain),
+        '-d', str(device),
         '-l', str(squelch),
     ]