feat: add backup alert background poller

backend/src/media_library_viewer_api/main.py

@@ -12,11 +12,13 @@ from fastapi.middleware.cors import CORSMiddleware
 
 from media_library_viewer_api.auth import require_jwt_auth, validate_auth_settings
 from media_library_viewer_api.config import get_settings
-from media_library_viewer_api.logging_utils import configure_logging, describe_settings
-from media_library_viewer_api.routers import dashboard, monitoring, media, files, jobs, users, tasks
-from .version import get_backend_version, get_version_info
-from media_library_viewer_api.routers.settings import router as settings_router
 from media_library_viewer_api.dependencies import get_mail_queue, get_monitoring_poller
+from media_library_viewer_api.logging_utils import configure_logging, describe_settings
+from media_library_viewer_api.routers import dashboard, files, jobs, media, monitoring, tasks, users
+from media_library_viewer_api.routers.settings import router as settings_router
+
+from .services.backup_poller import get_backup_poller
+from .version import get_backend_version, get_version_info
 
 logger = logging.getLogger(__name__)
 
@@ -31,10 +33,13 @@ async def lifespan(app: FastAPI):
     logger.info("Managed known_hosts will be populated lazily on first successful SSH connection")
     mail_queue = get_mail_queue()
     monitoring_poller = get_monitoring_poller()
+    backup_poller = get_backup_poller()
     mail_queue.start()
     monitoring_poller.start()
+    backup_poller.start()
     yield
     monitoring_poller.stop()
+    backup_poller.stop()
     mail_queue.stop()
     logger.info("Backend shutdown complete")
 
@@ -42,7 +47,10 @@ async def lifespan(app: FastAPI):
 app = FastAPI(
     title="Manage API",
     version=get_backend_version(),
-    description="Manage API for Jellyfin media browsing, SSH file inspection, server monitoring, and JWT-protected access.",
+    description=(
+        "Manage API for Jellyfin media browsing, SSH file inspection, "
+        "server monitoring, and JWT-protected access."
+    ),
     lifespan=lifespan,
 )