add cleanup for generated audio files; ensure temporary files are rem…

…oved after processing

api/src/utils/generate_audiocast.py

@@ -1,3 +1,5 @@
+import os
+
 from fastapi import BackgroundTasks, HTTPException
 
 from src.services.storage import StorageManager
@@ -36,6 +38,9 @@ def post_generate_audio(
         waveform_utils.run_all()
     except Exception as e:
         print(f"Error in generate_audiocast background_tasks: {str(e)}")
+    finally:
+        if os.path.exists(audio_path):
+            os.remove(audio_path)
 
 
 async def generate_audiocast(request: GenerateAudioCastRequest, background_tasks: BackgroundTasks):