Add Google Calendar integration via Supabase Edge Functions

- Create new create-google-meet-event edge function
- Use service account authentication (no OAuth needed)
- Add google_service_account_json field to platform_settings
- Add admin UI for service account JSON configuration
- Include test connection button in Integrasi tab
- Add comprehensive setup documentation
- Keep n8n workflows as alternative option

Features:
- Direct Google Calendar API integration
- JWT authentication with service account
- Auto-create Google Meet links
- No external dependencies needed
- Simple configuration via admin panel

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

supabase/migrations/20250323_add_google_service_account.sql

@@ -0,0 +1,7 @@
+-- Add google_service_account_json column to platform_settings
+-- This will store the encrypted service account JSON
+ALTER TABLE platform_settings
+ADD COLUMN IF NOT EXISTS google_service_account_json TEXT;
+
+-- Add comment
+COMMENT ON COLUMN platform_settings.google_service_account_json IS 'Google Service Account JSON for Calendar API integration (should be encrypted)';