Add media gallery with album organization and Puck integration

Backend:
- Add Album and MediaFile models for tenant-scoped media storage
- Add TenantStorageUsage model for per-tenant storage quota tracking
- Create StorageQuotaService with EntitlementService integration
- Add AlbumViewSet, MediaFileViewSet with bulk operations
- Add StorageUsageView for quota monitoring

Frontend:
- Create MediaGalleryPage with album management and file upload
- Add drag-and-drop upload with storage quota validation
- Create ImagePickerField custom Puck field for gallery integration
- Update Image, Testimonial components to use ImagePicker
- Add background image picker to Puck design controls
- Add gallery to sidebar navigation

Also includes:
- Puck marketing components (Hero, SplitContent, etc.)
- Enhanced ContactForm and BusinessHours components
- Platform login page improvements
- Site builder draft/preview enhancements

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

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

frontend/src/components/FloatingHelpButton.tsx

@@ -30,7 +30,7 @@ const routeToHelpPath: Record<string, string> = {
   '/plugins': '/help/plugins',
   '/plugins/marketplace': '/help/plugins',
   '/plugins/my-plugins': '/help/plugins',
-  '/plugins/create': '/help/plugins/create',
+  '/plugins/create': '/help/plugins/docs',
   '/settings': '/help/settings/general',
   '/settings/general': '/help/settings/general',
   '/settings/resource-types': '/help/settings/resource-types',