Separate timer function execution into dedicated worker process

- Move timer function scheduling and execution logic from `app.py` to new `worker.py`
- Update `Procfile` to launch worker process alongside web application
- Simplify main application startup by removing scheduler configuration
- Maintain existing timer function execution and logging behavior

Procfile

@@ -1 +1,2 @@
-web: gunicorn app:app --workers=4
+web: gunicorn app:app --workers=4
+worker: python worker.py