Refactor main.py to disable JIT, remove unused import, and update Numba and librosa caching

app/main.py

@@ -7,9 +7,10 @@ from app.core.firebase_config import initialize_firebase
 from app.api.forgery_routes import router as forgery_router
 import logging
 import os
+import tempfile
 os.environ['NUMBA_DISABLE_JIT'] = '1'
 os.environ['NUMBA_DISABLE_FUNCTION_CACHING'] = '1'
-os.environ['LIBROSA_CACHE_DIR'] = 'dummy'
+os.environ['NUMBA_CACHE_DIR'] = tempfile.gettempdir()
 import numba
 
 numba.config.DISABLE_JIT = True