feat(i18n): add zh_Hant and ja_JP translations to all adapter YAML files

- Add zh_Hant (Traditional Chinese) to all 17 adapter YAML metadata and config fields
- Add ja_JP translations to global adapters (Telegram, Discord, Slack, Lark, LINE)
- Fix buggy zh_Hant in line.yaml and slack.yaml (contained simplified Chinese)
- Add zh_Hant field to backend I18nString model
- Add adapter category grouping with locale-aware ordering
- Add webhook Cloud CTA for community edition users
- Fix wizard progress not clearing on skip/complete

src/langbot/pkg/platform/sources/qqofficial.yaml

@@ -5,19 +5,25 @@ metadata:
   label:
     en_US: QQ Official API
     zh_Hans: QQ 官方 API
+    zh_Hant: QQ 官方 API
   description:
     en_US: QQ Official API (Webhook)
     zh_Hans: QQ 官方 API (Webhook)，需要公网地址以接收消息推送，请查看文档了解使用方式
+    zh_Hant: QQ 官方 API (Webhook)，需要公網地址以接收訊息推送，請查看文件了解使用方式
   icon: qqofficial.svg
 spec:
+  categories:
+    - china
   config:
     - name: webhook_url
       label:
         en_US: Webhook Callback URL
         zh_Hans: Webhook 回调地址
+        zh_Hant: Webhook 回調地址
       description:
         en_US: Copy this URL and paste it into your QQ Official API webhook configuration
         zh_Hans: 复制此地址并粘贴到 QQ 官方 API 的 Webhook 配置中
+        zh_Hant: 複製此地址並貼到 QQ 官方 API 的 Webhook 設定中
       type: webhook-url
       required: false
       default: ""
@@ -25,6 +31,7 @@ spec:
       label:
         en_US: App ID
         zh_Hans: 应用ID
+        zh_Hant: 應用ID
       type: string
       required: true
       default: ""
@@ -32,6 +39,7 @@ spec:
       label:
         en_US: Secret
         zh_Hans: 密钥
+        zh_Hant: 密鑰
       type: string
       required: true
       default: ""
@@ -39,6 +47,7 @@ spec:
       label:
         en_US: Token
         zh_Hans: 令牌
+        zh_Hant: 令牌
       type: string
       required: true
       default: ""