feat: add i18n descriptions to all hands and channels (#22)

Add [i18n.zh], [i18n.zh-TW], [i18n.ja], [i18n.ko], [i18n.de], [i18n.es]
sections with translated descriptions to:
- 15 Hand TOML files (hands/*/HAND.toml)
- 44 Channel TOML files (channels/*.toml)

This enables the website to display localized Hand and Channel descriptions
based on the user's selected language.

channels/wechat.toml

@@ -5,6 +5,24 @@ category = "messaging"
 icon = "💚"
 protocol = "rest-api"
 
+[i18n.zh]
+description = "微信公众号适配器，在微信平台上收发消息"
+
+[i18n.zh-TW]
+description = "微信公眾號適配器，在微信平台上收發訊息"
+
+[i18n.ja]
+description = "WeChat公式アカウントアダプター、WeChatプラットフォームでのメッセージング"
+
+[i18n.ko]
+description = "WeChat 공식 계정 어댑터, WeChat 플랫폼에서 메시지 송수신"
+
+[i18n.de]
+description = "WeChat Official Account-Adapter für Nachrichten auf der WeChat-Plattform"
+
+[i18n.es]
+description = "Adaptador de cuenta oficial de WeChat para mensajería en la plataforma WeChat"
+
 [metadata]
 url = "https://www.wechat.com"
 docs = "https://developers.weixin.qq.com/doc/offiaccount/en/Getting_Started/Overview.html"