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.

scripts/after-pack.cjs

@@ -438,6 +438,7 @@ exports.default = async function afterPack(context) {
     { npmName: '@wecom/wecom-openclaw-plugin', pluginId: 'wecom' },
     { npmName: '@sliverp/qqbot', pluginId: 'qqbot' },
     { npmName: '@larksuite/openclaw-lark', pluginId: 'feishu-openclaw-plugin' },
+    { npmName: '@tencent-weixin/openclaw-weixin', pluginId: 'openclaw-weixin' },
   ];
 
   mkdirSync(pluginsDestRoot, { recursive: true });