Add display brightness and power control

- New display service with DDC/CI brightness and power control via screen_brightness_control and monitorcontrol
- New /api/display/* endpoints (monitors, brightness, power)
- Display tab in WebUI with per-monitor brightness sliders and power toggle
- EDID resolution parsing to distinguish same-name monitors
- Throttled brightness slider (50ms) matching volume control pattern

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

media_server/main.py

@@ -16,7 +16,7 @@ from fastapi.staticfiles import StaticFiles
 from . import __version__
 from .auth import get_token_label, token_label_var
 from .config import settings, generate_default_config, get_config_dir
-from .routes import audio_router, browser_router, callbacks_router, health_router, media_router, scripts_router
+from .routes import audio_router, browser_router, callbacks_router, display_router, health_router, media_router, scripts_router
 from .services import get_media_controller
 from .services.websocket_manager import ws_manager
 
@@ -116,6 +116,7 @@ def create_app() -> FastAPI:
     app.include_router(audio_router)
     app.include_router(browser_router)
     app.include_router(callbacks_router)
+    app.include_router(display_router)
     app.include_router(health_router)
     app.include_router(media_router)
     app.include_router(scripts_router)