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/en-US.ts

@@ -321,6 +321,12 @@ const enUS = {
     webhookSaasHint:
       'Webhook requires a publicly accessible domain. LangBot Cloud provides a ready-to-use public endpoint for your bot.',
     webhookSaasLink: 'Learn more about LangBot Cloud',
+    adapterCategory: {
+      popular: 'Popular',
+      china: 'China',
+      global: 'Global',
+      protocol: 'Protocol',
+    },
     logLevel: 'Log Level',
     allLevels: 'All Levels',
     selectLevel: 'Select Level',