feat: add adapter documentation link button

Add 'View Docs' button that links to the corresponding adapter's
documentation page via link.langbot.app short links.

Appears in:
- Wizard adapter selection cards (Step 0)
- Wizard bot config card header (Step 1)
- Bot create/edit form (adapter config section)

Supports all 7 languages (en/zh-Hans/zh-Hant/ja/th/vi/es).
Doc links auto-resolve to the correct language based on UI locale.

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

@@ -276,6 +276,7 @@ const zhHans = {
     platformAdapter: '平台/适配器选择',
     selectAdapter: '选择适配器',
     adapterConfig: '适配器配置',
+    viewAdapterDocs: '查看文档',
     bindPipeline: '绑定流水线',
     selectPipeline: '选择流水线',
     selectBot: '请选择机器人',