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

web/src/i18n/locales/zh-Hant.ts

@@ -305,6 +305,12 @@ const zhHant = {
     webhookSaasHint:
       'Webhook 需要公網可存取的網域。LangBot Cloud 為你的機器人提供即開即用的公網位址。',
     webhookSaasLink: '了解 LangBot Cloud',
+    adapterCategory: {
+      popular: '熱門',
+      china: '中國',
+      global: '全球',
+      protocol: '協定',
+    },
     logLevel: '日誌級別',
     allLevels: '全部級別',
     selectLevel: '選擇級別',