feat: enforce 48kHz audio capture and fix device detection

- Changed audio capture rate to fixed 48kHz instead of using device default to prevent resampling latency and 44.1kHz compatibility issues
- Updated device detection to use get_alsa_usb_inputs() instead of get_usb_pw_inputs() for more accurate USB audio device discovery
- Maintains original channel count logic to use maximum of 2 channels based on device capabilities

src/auracast/server/multicast_server.py

@@ -198,7 +198,8 @@ class StreamerWorker: # TODO: is wraping in this Worker stricly nececcarry ?
                 if big.audio_source.startswith('device:'):
                     big.audio_source = f'device:{device_index}'
             devinfo = sd.query_devices(device_index)
-            capture_rate = int(devinfo.get('default_samplerate') or 48000)
+            # Force capture at 48 kHz to avoid resampler latency and 44.1 kHz incompatibilities
+            capture_rate = 48000
             max_in = int(devinfo.get('max_input_channels') or 1)
             channels = max(1, min(2, max_in))
             for big in conf.bigs:
@@ -446,7 +447,7 @@ async def _autostart_from_settings():
                 ):
                     return
             # Check against the cached device lists
-            usb = [d for _, d in get_usb_pw_inputs()]
+            usb = [d for _, d in get_alsa_usb_inputs()]
             net = [d for _, d in get_network_pw_inputs()]
             names = {d.get('name') for d in usb} | {d.get('name') for d in net}
             if input_device_name in names: