Add Puck site builder with preview and draft functionality

Frontend:
- Add comprehensive Puck component library (Layout, Content, Booking, Contact)
- Add Services component with usePublicServices hook integration
- Add 150+ icons to IconList component organized by category
- Add preview modal with viewport toggles (desktop/tablet/mobile)
- Add draft save/discard functionality with localStorage persistence
- Add draft status indicator in PageEditor toolbar
- Fix useSites hooks to use correct API URLs (/pages/{id}/)

Backend:
- Add SiteConfig model for theme, header, footer configuration
- Add Page SEO fields (meta_title, meta_description, og_image, etc.)
- Add puck_data validation for component structure
- Add create_missing_sites management command
- Fix PageViewSet to use EntitlementService for permissions
- Add comprehensive tests for site builder functionality

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

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

frontend/src/hooks/useSites.ts

@@ -25,7 +25,7 @@ export const usePage = (pageId: string) => {
   return useQuery({
     queryKey: ['page', pageId],
     queryFn: async () => {
-      const response = await api.get(`/sites/me/pages/${pageId}/`);
+      const response = await api.get(`/pages/${pageId}/`);
       return response.data;
     },
     enabled: !!pageId,
@@ -36,7 +36,7 @@ export const useUpdatePage = () => {
   const queryClient = useQueryClient();
   return useMutation({
     mutationFn: async ({ id, data }: { id: string; data: any }) => {
-      const response = await api.patch(`/sites/me/pages/${id}/`, data);
+      const response = await api.patch(`/pages/${id}/`, data);
       return response.data;
     },
     onSuccess: (data, variables) => {
@@ -63,7 +63,7 @@ export const useDeletePage = () => {
   const queryClient = useQueryClient();
   return useMutation({
     mutationFn: async (id: string) => {
-      await api.delete(`/sites/me/pages/${id}/`);
+      await api.delete(`/pages/${id}/`);
     },
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['pages'] });
@@ -81,3 +81,41 @@ export const usePublicPage = () => {
     retry: false,
   });
 };
+
+export const useSiteConfig = () => {
+  return useQuery({
+    queryKey: ['siteConfig'],
+    queryFn: async () => {
+      const response = await api.get('/sites/me/config/');
+      return response.data;
+    },
+  });
+};
+
+export const useUpdateSiteConfig = () => {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: async (data: {
+      theme?: Record<string, unknown>;
+      header?: Record<string, unknown>;
+      footer?: Record<string, unknown>;
+    }) => {
+      const response = await api.patch('/sites/me/config/', data);
+      return response.data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['siteConfig'] });
+    },
+  });
+};
+
+export const usePublicSiteConfig = () => {
+  return useQuery({
+    queryKey: ['publicSiteConfig'],
+    queryFn: async () => {
+      const response = await api.get('/public/site-config/');
+      return response.data;
+    },
+    retry: false,
+  });
+};