Revert "Add configurable input device selection"

This reverts commit 7ca6958488.

app/audio/stt.py

@@ -128,16 +128,13 @@ class SpeechRecognizer:
     def _get_stream(self):
         """Открывает аудиопоток PyAudio, если он еще не открыт."""
         if self.stream is None:
-            device_index, device_info = get_audio_manager().resolve_input_device()
             self.stream = self.pa.open(
                 rate=SAMPLE_RATE,
                 channels=1,
                 format=pyaudio.paInt16,
                 input=True,
-                input_device_index=device_index,
                 frames_per_buffer=4096,
             )
-            print(f"🎙️ STT input: {device_info.get('name', 'unknown')}")
         return self.stream
 
     async def _process_audio(