feat: game integration system

Receive real-time events from games (CS2, Dota 2, LoL, etc.) and drive
LED effects through the existing color strip and value source pipelines.

Core:
- GameEventBus (thread-safe pub/sub) with standardized 23-type event vocabulary
- GameAdapter ABC + AdapterRegistry + MappingAdapter (YAML-driven)
- Built-in adapters: CS2 GSI, Dota 2 GSI, LoL Live Client, Generic Webhook
- Community YAML adapters: Minecraft, Valorant, Rocket League
- GameEventColorStripStream with 5 effects (flash/pulse/sweep/color_shift/breathing)
- GameEventValueSource with EMA smoothing and timeout
- 4 built-in effect presets (FPS Combat, MOBA Health, Racing, Generic Alert)
- Auto-setup for Valve GSI games (Steam path detection, cfg file writing)
- Demo capture engine exposed to non-demo mode

Frontend:
- Game tab in Streams tree navigation with integration cards
- Game integration editor modal with adapter picker, config fields, event mappings
- game_event source type in CSS and ValueSource editors
- Setup instructions overlay (markdown rendered)
- Live event monitor and connection test

API:
- Full CRUD for game integrations
- Event ingestion endpoint (adapter-level auth)
- Adapter metadata, presets, auto-setup, status/diagnostics endpoints

server/src/wled_controller/api/__init__.py

@@ -26,6 +26,7 @@ from .routes.weather_sources import router as weather_sources_router
 from .routes.update import router as update_router
 from .routes.assets import router as assets_router
 from .routes.home_assistant import router as home_assistant_router
+from .routes.game_integration import router as game_integration_router
 
 router = APIRouter()
 router.include_router(system_router)
@@ -52,5 +53,6 @@ router.include_router(weather_sources_router)
 router.include_router(update_router)
 router.include_router(assets_router)
 router.include_router(home_assistant_router)
+router.include_router(game_integration_router)
 
 __all__ = ["router"]