Add per-site Webflow configuration

[simonsmallchua]

Summary

• Adds per-site configuration for Webflow sites after OAuth completion
• Each site can have a schedule (None/6h/12h/24h/48h) and "Run on Publish" toggle
• Sites displayed in settings modal with search (>5 sites) and pagination (>10 sites)

Changes

• Database: New webflow_site_settings table with RLS policies
• Backend: 3 new API endpoints for sites list, schedule, and auto-publish
• Frontend: Site configuration UI in settings modal with auto-save

New API Endpoints

• GET /v1/integrations/webflow/{connection_id}/sites - List sites with settings
• PUT /v1/integrations/webflow/sites/{site_id}/schedule - Update schedule
• PUT /v1/integrations/webflow/sites/{site_id}/auto-publish - Toggle webhook

Test plan

• Connect Webflow via OAuth, verify sites appear in modal
• Change schedule dropdown, verify scheduler created/updated
• Toggle auto-publish, verify webhook registered/removed
• Publish in Webflow, verify job created only when toggle is ON
• Search sites with >5 in workspace
• Pagination with >10 configured sites

Summary by CodeRabbit

• New Features

  • Per‑site Webflow configuration UI: searchable, paginated site list with loading/empty states, schedule options (6/12/24/48h), Refresh and Run‑on‑Publish toggles; settings modal auto‑opens after connecting.

• Bug Fixes

  • Cleans up stored Webflow secrets on connection delete and on token storage failure.
  • Dashboard skips actions prefixed with webflow‑/site‑.
  • Improved schedule dropdown and auto‑publish toggle responsiveness; webhook handling now respects per‑site enablement.

• Chores

  • Backend APIs, DB schema/migrations and test mocks added to persist per‑site settings, webhooks and schedulers.

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