Add max_public_pages feature and site builder access control

- Add max_public_pages billing feature (Free=0, Starter=1, Growth=5, Pro=10)
- Gate site builder access based on max_public_pages entitlement
- Auto-create Site with default booking page for new tenants
- Update PageEditor to use useEntitlements hook for permission checks
- Replace hardcoded limits in BusinessEditModal with DynamicFeaturesEditor
- Add force update functionality for superusers in PlanEditorWizard
- Add comprehensive filters to all safe scripting get_* methods
- Update plugin documentation with full filter reference

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

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

frontend/src/hooks/useEntitlements.ts

@@ -127,6 +127,7 @@ export const FEATURE_CODES = {
   MAX_RESOURCES: 'max_resources',
   MAX_EVENT_TYPES: 'max_event_types',
   MAX_CALENDARS_CONNECTED: 'max_calendars_connected',
+  MAX_PUBLIC_PAGES: 'max_public_pages',
 } as const;
 
 export type FeatureCode = (typeof FEATURE_CODES)[keyof typeof FEATURE_CODES];