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/api/__init__.py

@@ -25,6 +25,7 @@ from .routes.sync_clocks import router as sync_clocks_router
 from .routes.color_strip_processing import router as cspt_router
 from .routes.gradients import router as gradients_router
 from .routes.weather_sources import router as weather_sources_router
+from .routes.update import router as update_router
 
 router = APIRouter()
 router.include_router(system_router)
@@ -50,5 +51,6 @@ router.include_router(sync_clocks_router)
 router.include_router(cspt_router)
 router.include_router(gradients_router)
 router.include_router(weather_sources_router)
+router.include_router(update_router)
 
 __all__ = ["router"]