Add OpenRGB device support for PC peripheral ambient lighting

New device type enabling control of keyboards, mice, RAM, GPU, and fans
via the OpenRGB SDK server (TCP port 6742). Includes auto-discovery,
health monitoring, state snapshot/restore, and fast synchronous pixel
send with brightness scaling. Also updates TODO.md with complexity notes.

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

server/src/wled_controller/static/locales/zh.json

@@ -134,6 +134,9 @@
   "device.mqtt_topic.placeholder": "mqtt://ledgrab/device/客厅",
   "device.ws_url": "连接 URL：",
   "device.ws_url.hint": "客户端连接并接收 LED 数据的 WebSocket URL",
+  "device.openrgb.url": "OpenRGB URL：",
+  "device.openrgb.url.hint": "OpenRGB 服务器地址（例如 openrgb://localhost:6742/0）",
+  "device.type.openrgb": "OpenRGB",
   "device.url.hint": "设备的 IP 地址或主机名（例如 http://192.168.1.100）",
   "device.name": "设备名称：",
   "device.name.placeholder": "客厅电视",