feat(大屏): 视频识别直连 park-vision + 绑定轮询/二维码

- config.js 增 getVisionApiBase()，优先绑定下发的本园区 vision_api(经 tenant info)
- main.jsx bootstrap 读 /park/api/config 的 vision_api
- useVisionDetection 帧 POST 到独立 vision 服务；未配置识别整体禁用
- BindScreen 连接码轮询(无码5s/有码30min) + 渲染二维码(qrcode.react)、绑定后入园区
- 部署文档补 vision_api/识别服务说明

yarn.lock

@@ -1167,6 +1167,11 @@ promise-worker-transferable@^1.0.4:
     is-promise "^2.1.0"
     lie "^3.0.2"
 
+qrcode.react@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.npmmirror.com/qrcode.react/-/qrcode.react-4.2.0.tgz"
+  integrity sha512-QpgqWi8rD9DsS9EP3z7BT+5lY5SFhsqGjpgW5DY/i3mK4M9DTBNz3ErMi8BWYEfI3L0d8GIbGmcdFAS1uIRGjA==
+
 react-day-picker@^10.0.1:
   version "10.0.1"
   resolved "https://registry.npmmirror.com/react-day-picker/-/react-day-picker-10.0.1.tgz"