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.

electron/preload/index.ts

@@ -159,6 +159,9 @@ const electronAPI = {
         'channel:whatsapp-qr',
         'channel:whatsapp-success',
         'channel:whatsapp-error',
+        'channel:wechat-qr',
+        'channel:wechat-success',
+        'channel:wechat-error',
         'gateway:exit',
         'gateway:error',
         'navigate',
@@ -203,6 +206,12 @@ const electronAPI = {
         'gateway:notification',
         'gateway:channel-status',
         'gateway:chat-message',
+        'channel:whatsapp-qr',
+        'channel:whatsapp-success',
+        'channel:whatsapp-error',
+        'channel:wechat-qr',
+        'channel:wechat-success',
+        'channel:wechat-error',
         'gateway:exit',
         'gateway:error',
         'navigate',