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/en-US.ts

@@ -288,6 +288,7 @@ const enUS = {
     platformAdapter: 'Platform/Adapter Selection',
     selectAdapter: 'Select Adapter',
     adapterConfig: 'Adapter Configuration',
+    viewAdapterDocs: 'View Docs',
     bindPipeline: 'Bind Pipeline',
     selectPipeline: 'Select Pipeline',
     selectBot: 'Select Bot',