fix: enhance error responses in audio processing endpoint with structured details

app/routes/data_processing.py

@@ -26,17 +26,17 @@ async def process_audio_endpoint(
     logger.info(f"Received audio processing request for file: {file.filename}")
 
     if not file.content_type or not file.content_type.startswith("audio/"):
-        raise HTTPException(status_code=400, detail="Invalid file type. Must be audio.")
+        raise HTTPException(status_code=400, detail={"code": "invalid_file_type", "message": "Invalid file type. Must be audio."})
 
     try:
         # Read file content with size guard
         content = await file.read()
         if len(content) > MAX_PAYLOAD_BYTES:
-            raise HTTPException(status_code=413, detail=f"File too large. Maximum size is {MAX_PAYLOAD_BYTES // (1024*1024)} MB.")
-        
+            raise HTTPException(status_code=413, detail={"code": "file_too_large", "message": f"File too large. Maximum size is {MAX_PAYLOAD_BYTES // (1024*1024)} MB."})
+
         # Process audio
         processed_audio = process_audio(content, options)
-        
+
         # Return as downloadable file
         filename = f"processed_{file.filename}.wav"
         return StreamingResponse(
@@ -46,7 +46,7 @@ async def process_audio_endpoint(
         )
 
     except ValueError as e:
-        raise HTTPException(status_code=400, detail=str(e))
+        raise HTTPException(status_code=400, detail={"code": "validation_error", "message": str(e)})
     except Exception as e:
         logger.error(f"Unexpected error in audio processing: {e}", exc_info=True)
-        raise HTTPException(status_code=500, detail="Internal server error during audio processing")
+        raise HTTPException(status_code=500, detail={"code": "internal_error", "message": "Internal server error during audio processing"})