Add static color for simple devices, change auto-shutdown to auto-restore

- Add `static_color` capability to Adalight provider with `set_color()` method
- Add `static_color` field to Device model, DeviceState, and API schemas
- Add GET/PUT `/devices/{id}/color` API endpoints
- Change auto-shutdown behavior: restore device to idle state instead of
  powering off (WLED uses snapshot/restore, Adalight sends static color
  or black frame)
- Rename `_auto_shutdown_device_if_idle` to `_restore_device_idle_state`
- Add inline color picker on device cards for devices with static_color
- Add auto_shutdown toggle to device settings modal
- Update labels from "Auto Shutdown" to "Auto Restore" (en + ru)
- Remove backward-compat KC aliases from ProcessorManager
- Align card action buttons to bottom with flex column layout

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

server/src/wled_controller/main.py

@@ -160,6 +160,7 @@ async def lifespan(app: FastAPI):
                 baud_rate=device.baud_rate,
                 software_brightness=device.software_brightness,
                 auto_shutdown=device.auto_shutdown,
+                static_color=device.static_color,
             )
             logger.info(f"Registered device: {device.name} ({device.id})")
         except Exception as e: