feat: Implement core application structure, AI extraction, persistence, and Telegram bot modules with updated configuration and dependencies.

app/scheduler.py

@@ -0,0 +1,26 @@
+"""
+Handles background jobs, retries, and scheduled tasks.
+
+For example, this could be used for:
+- Retrying failed API calls.
+- Sending daily or weekly expense summaries.
+- Cleaning up old raw files.
+"""
+import logging
+
+logger = logging.getLogger(__name__)
+
+def schedule_daily_summary():
+    """
+    Placeholder for a function that would be run on a schedule
+    by a library like APScheduler or Celery.
+    """
+    logger.info("Scheduler: Running daily summary job (stub).")
+
+# You would typically initialize and run a scheduler here, for example:
+#
+# from apscheduler.schedulers.background import BackgroundScheduler
+#
+# scheduler = BackgroundScheduler()
+# scheduler.add_job(schedule_daily_summary, 'cron', hour=8)
+# scheduler.start()