Fix inference.py - properly write WAV files with audio data

inference.py

@@ -50,9 +50,16 @@ def synthesize_text(text, model_path, output_path, config_path=None):
     # Synthesize
     print(f"Synthesizing: {text}")
     try:
-        with open(output_path, 'wb') as f:
-            # Write WAV header
-            voice.synthesize(text, f)
+        import wave
+        
+        with wave.open(output_path, 'wb') as wav_file:
+            wav_file.setframerate(voice.config.sample_rate)
+            wav_file.setsampwidth(2)  # 16-bit
+            wav_file.setnchannels(1)  # Mono
+            
+            for audio_chunk in voice.synthesize(text):
+                wav_file.writeframes(audio_chunk.audio_int16_bytes)
+        
         print(f"✓ Audio saved to: {output_path}")
     except Exception as e:
         print(f"Error during synthesis: {e}")