Fix: Update all paths to be absolute and robust

main.py

@@ -38,7 +38,9 @@ async def detect_voice(
     audio_url: str = Form(None),
     x_api_key: str = Depends(verify_api_key)
 ):
-    UPLOAD_DIR = "uploads" # Ensure this is defined or imported, doing it locally for safety if imports fail context
+    import os
+    UPLOAD_DIR = os.path.join(os.getcwd(), "uploads")
+    os.makedirs(UPLOAD_DIR, exist_ok=True)
 
     # Check if we received a JSON body (request is not None)
     if request:
@@ -52,9 +54,8 @@ async def detect_voice(
                 
                 decoded_data = base64.b64decode(b64_data)
                 # Create a temporary file
-                import os # ensuring os is available
                 filename = f"upload_{uuid.uuid4()}.{request.audio_format or 'mp3'}"
-                file_location = f"{UPLOAD_DIR}/{filename}"
+                file_location = os.path.join(UPLOAD_DIR, filename)
                 with open(file_location, "wb") as f:
                     f.write(decoded_data)