refactor(task): move schedulers and startup/shutdown task into tasks directory

app/tasks/database_cleanup.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+from app.dependencies.database import with_db
+from app.dependencies.scheduler import get_scheduler
+from app.log import logger
+from app.service.database_cleanup_service import DatabaseCleanupService
+
+
+@get_scheduler().scheduled_job(
+    "interval",
+    id="cleanup_database",
+    hours=1,
+)
+async def scheduled_cleanup_job():
+    async with with_db() as session:
+        logger.info("Starting database cleanup...")
+        results = await DatabaseCleanupService.run_full_cleanup(session)
+        total = sum(results.values())
+        if total > 0:
+            logger.success(f"Cleanup completed, total records cleaned: {total}")
+        return results