feat: add Tencent WeChat channel plugin and update related configurations

- Added the Tencent WeChat channel plugin (`@tencent-weixin/openclaw-weixin`) to the project dependencies.
- Updated the `pnpm-lock.yaml` to include the new plugin version.
- Enhanced the README files to document the WeChat integration process.
- Implemented QR code login functionality for WeChat in the channel management system.
- Updated UI components to support WeChat channel configuration and display.
- Added localization support for WeChat connection messages in English, Japanese, and Chinese.

package.json

@@ -80,6 +80,7 @@
         "@radix-ui/react-toast": "^1.2.15",
         "@radix-ui/react-tooltip": "^1.2.8",
         "@sliverp/qqbot": "^1.6.1",
+        "@tencent-weixin/openclaw-weixin": "^1.0.2",
         "@soimy/dingtalk": "^3.3.0",
         "@testing-library/jest-dom": "^6.9.1",
         "@testing-library/react": "^16.3.2",