feat: add auto-update system with release checking, notification UI, and install-type-aware apply

- Abstract ReleaseProvider interface (Gitea impl, swappable for GitHub/GitLab)
- Background UpdateService with periodic checks, debounce, dismissed version persistence
- Install type detection (installer/portable/docker/dev) with platform-aware asset matching
- Download with progress events, silent NSIS reinstall, portable ZIP/tarball swap scripts
- Version badge pulse animation, dismissible banner with icon buttons, Settings > Updates tab
- Single source of truth: pyproject.toml version via importlib.metadata, CI stamps tag with sed
- API: GET/POST status, check, dismiss, apply, GET/PUT settings
- i18n: en, ru, zh (27+ keys each)

server/src/wled_controller/main.py

@@ -41,6 +41,8 @@ from wled_controller.core.mqtt.mqtt_service import MQTTService
 from wled_controller.core.devices.mqtt_client import set_mqtt_service
 from wled_controller.core.backup.auto_backup import AutoBackupEngine
 from wled_controller.core.processing.os_notification_listener import OsNotificationListener
+from wled_controller.core.update.update_service import UpdateService
+from wled_controller.core.update.gitea_provider import GiteaReleaseProvider
 from wled_controller.storage.database import Database
 from wled_controller.utils import setup_logging, get_logger, install_broadcast_handler
 
@@ -167,6 +169,18 @@ async def lifespan(app: FastAPI):
         db=db,
     )
 
+    # Create update service (checks for new releases)
+    _release_provider = GiteaReleaseProvider(
+        base_url="https://git.dolgolyov-family.by",
+        repo="alexei.dolgolyov/wled-screen-controller-mixed",
+    )
+    update_service = UpdateService(
+        provider=_release_provider,
+        db=db,
+        fire_event=processor_manager.fire_event,
+        update_dir=_data_dir / "updates",
+    )
+
     # Initialize API dependencies
     init_dependencies(
         device_store, template_store, processor_manager,
@@ -189,6 +203,7 @@ async def lifespan(app: FastAPI):
         gradient_store=gradient_store,
         weather_source_store=weather_source_store,
         weather_manager=weather_manager,
+        update_service=update_service,
     )
 
     # Register devices in processor manager for health monitoring
@@ -235,6 +250,9 @@ async def lifespan(app: FastAPI):
     # Start auto-backup engine (periodic configuration backups)
     await auto_backup_engine.start()
 
+    # Start update checker (periodic release polling)
+    await update_service.start()
+
     # Start OS notification listener (Windows toast → notification CSS streams)
     os_notif_listener = OsNotificationListener(
         color_strip_store=color_strip_store,
@@ -258,6 +276,12 @@ async def lifespan(app: FastAPI):
     except Exception as e:
         logger.error(f"Error stopping weather manager: {e}")
 
+    # Stop update checker
+    try:
+        await update_service.stop()
+    except Exception as e:
+        logger.error(f"Error stopping update checker: {e}")
+
     # Stop auto-backup engine
     try:
         await auto_backup_engine.stop()