fix concat

api.py

@@ -223,7 +223,7 @@ async def process_audio(audio_data: bytes, language: str = "auto") -> str:
             padding = np.zeros((1, padding_length), dtype=np.float32)
             print(input_wav.shape)
             print(padding.shape)
-            input_wav = np.concatenate((input_wav, padding), axis=0)
+            input_wav = np.concatenate((input_wav, padding), axis=1)
 
         # Model inference
         text = model.generate(