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/openclaw_weixin.yaml

@@ -5,19 +5,26 @@ metadata:
   label:
     en_US: OpenClaw WeChat
     zh_Hans: 个人微信机器人
+    zh_Hant: 個人微信機器人
   description:
     en_US: OpenClaw WeChat adapter, supports personal WeChat via QR code login
     zh_Hans: 微信官方个人助手，扫码即可登录使用
+    zh_Hant: 微信官方個人助手，掃碼即可登入使用
   icon: wechat.png
 spec:
+  categories:
+    - popular
+    - china
   config:
     - name: base_url
       label:
         en_US: API Base URL
         zh_Hans: API 基础地址
+        zh_Hant: API 基礎地址
       description:
         en_US: The base URL of the OpenClaw WeChat backend API
         zh_Hans: OpenClaw 微信后端 API 的基础地址
+        zh_Hant: OpenClaw 微信後端 API 的基礎地址
       type: string
       required: true
       default: "https://ilinkai.weixin.qq.com"
@@ -25,9 +32,11 @@ spec:
       label:
         en_US: Token
         zh_Hans: 令牌
+        zh_Hant: 令牌
       description:
         en_US: Bearer token obtained after QR code login authorization. Leave empty to trigger QR code login on startup.
         zh_Hans: 扫码登录授权后获取的 Bearer 令牌。请留空并保存，将在启动时输出二维码到日志，扫码后即可自动登录。
+        zh_Hant: 掃碼登入授權後取得的 Bearer 令牌。請留空並儲存，將在啟動時輸出 QR Code 到日誌，掃碼後即可自動登入。
       type: string
       required: false
       default: ""
@@ -35,9 +44,11 @@ spec:
       label:
         en_US: Account ID
         zh_Hans: 账号标识
+        zh_Hant: 帳號標識
       description:
         en_US: A label for this WeChat account (used for display purposes)
         zh_Hans: 此微信账号的标识（用于显示）
+        zh_Hant: 此微信帳號的標識（用於顯示）
       type: string
       required: false
       default: "openclaw-weixin"
@@ -45,9 +56,11 @@ spec:
       label:
         en_US: Poll Timeout (seconds)
         zh_Hans: 轮询超时（秒）
+        zh_Hant: 輪詢逾時（秒）
       description:
         en_US: Long-poll timeout for getUpdates, the server may hold the request up to this duration
         zh_Hans: getUpdates 长轮询超时时间，服务端最多持有请求的时长
+        zh_Hant: getUpdates 長輪詢逾時時間，伺服端最多持有請求的時長
       type: integer
       required: false
       default: 35