feat(worker): add device registration_id cleanup worker

Add DeviceCleanupWorker to periodically clean up stale device tokens that haven't
been used within the retention period. This prevents accumulation of invalid
registration_ids and maintains data hygiene.

- New DeviceCleanupConfig with enabled, retention_days (3), and interval_minutes (360)
- New repository methods DeleteStaleDevices and DeleteOldestActiveDevice
- Updated RegisterDevice to evict oldest active device when reaching limit
- Reduced MaxDevicesPerUser from 10 to 3 per user
- Worker integrated into app startup/shutdown lifecycle

cmd/server/wire_gen.go

@@ -165,10 +165,11 @@ func InitializeApp() (*App, error) {
 	router := ProvideRouter(userRepository, userHandler, postHandler, commentHandler, messageHandler, notificationHandler, uploadHandler, jwtService, pushHandler, systemMessageHandler, groupHandler, stickerHandler, voteHandler, channelHandler, scheduleHandler, gradeHandler, examHandler, emptyClassroomHandler, roleHandler, adminUserHandler, adminPostHandler, adminCommentHandler, adminGroupHandler, adminDashboardHandler, adminLogHandler, qrCodeHandler, materialHandler, callHandler, reportHandler, adminReportHandler, verificationHandler, adminVerificationHandler, adminProfileAuditHandler, setupHandler, tradeHandler, logService, userActivityService, casbinService, userService, wsHandler, liveKitHandler)
 	hotRankWorker := wire.ProvideHotRankWorker(config, postRepository, channelRepository, cache, client)
 	fileCleanupWorker := wire.ProvideFileCleanupWorker(config, uploadedFileRepository, s3Client, client)
+	deviceCleanupWorker := wire.ProvideDeviceCleanupWorker(config, deviceTokenRepository, client)
 	server := wire.ProvideGRPCServer(config, logger, runnerHub)
 	runnerRegistry := wire.ProvideRunnerRegistry(config, client)
 	taskDispatcher := wire.ProvideTaskDispatcher(runnerHub, runnerRegistry, config, client, logger)
-	app := NewApp(config, db, router, pushService, hotRankWorker, fileCleanupWorker, server, messagePublisher, taskDispatcher, logger, pushWorker)
+	app := NewApp(config, db, router, pushService, hotRankWorker, fileCleanupWorker, deviceCleanupWorker, server, messagePublisher, taskDispatcher, logger, pushWorker)
 	return app, nil
 }