add openai model to config, rework logging to use appdirs logging dir

src/backend/threads_availchecker.py

@@ -5,7 +5,7 @@ from PyQt6.QtCore import QThread
 from PyQt6.QtCore import pyqtSignal as Signal
 
 from src.backend.database import Database
-
+from src import LOG_DIR
 from src.logic.webrequest import BibTextTransformer, WebRequest
 
 # from src.transformers import RDS_AVAIL_DATA
@@ -15,7 +15,7 @@ import sys
 log = loguru.logger
 log.remove()
 log.add(sys.stdout, level="INFO")
-log.add("logs/application.log", rotation="1 MB", retention="10 days")
+log.add(f"{LOG_DIR}/application.log", rotation="1 MB", retention="10 days")