Feat/space cta optimization (#2089)

* feat(wizard): persist wizard progress to backend for session resumption

Store wizard step, selected adapter, created bot UUID, and runner
selection in the metadata table. On revisit, the wizard restores
progress and verifies the bot still exists. Progress is cleared
automatically when the wizard is completed or skipped.

* feat(dynamic-form): optimize LLM model selection with space login CTA and improve localization strings

* feat(web): add LangBot Cloud CTA for webhook URL fields in community edition

Show a subtle hint below webhook URL fields prompting users about
LangBot Cloud's public endpoint, only visible in community edition.
Covers all 8 webhook-based adapters with i18n support (4 locales).

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

@@ -221,6 +221,10 @@ const zhHant = {
     loginWithSpace: '使用 Space 登入',
     loginToUseModels: '使用 Space 登入以使用雲端模型',
     noModels: '暫無模型',
+    langbotModels: 'LangBot 模型',
+    spaceTrialTooltip:
+      '免費試用積分已就緒！使用 Space 登入即可零設定使用雲端模型。',
+    unlockModels: '登入以使用',
     editProvider: '編輯供應商',
     addProvider: '新增供應商',
     addProviderHint: '新增供應商以使用其他來源的模型',
@@ -298,6 +302,9 @@ const zhHant = {
     webhookUrlHint:
       '點擊輸入框自動全選，然後按 Ctrl+C (Mac: Cmd+C) 複製，或點擊右側按鈕',
     webhookUrlHintEither: '以上兩個地址任選其一填入平台配置即可',
+    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',
     logLevel: '日誌級別',
     allLevels: '全部級別',
     selectLevel: '選擇級別',