feat(time-blocks): Add comprehensive time blocking system with contracts

- Add TimeBlock and Holiday models with recurrence support (one-time, weekly, monthly, yearly, holiday)
- Implement business-level and resource-level blocking with hard/soft block types
- Add multi-select holiday picker for bulk holiday blocking
- Add calendar overlay visualization with distinct colors:
  - Business blocks: Red (hard) / Yellow (soft)
  - Resource blocks: Purple (hard) / Cyan (soft)
- Add month view resource indicators showing 1/n width per resource
- Add yearly calendar view for block overview
- Add My Availability page for staff self-service
- Add contracts module with templates, signing flow, and PDF generation
- Update scheduler with click-to-day navigation in week view

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

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

frontend/src/components/FloatingHelpButton.tsx

@@ -20,9 +20,13 @@ const routeToHelpPath: Record<string, string> = {
   '/services': '/help/services',
   '/resources': '/help/resources',
   '/staff': '/help/staff',
+  '/time-blocks': '/help/time-blocks',
+  '/my-availability': '/help/time-blocks',
   '/messages': '/help/messages',
   '/tickets': '/help/ticketing',
   '/payments': '/help/payments',
+  '/contracts': '/help/contracts',
+  '/contracts/templates': '/help/contracts',
   '/plugins': '/help/plugins',
   '/plugins/marketplace': '/help/plugins',
   '/plugins/my-plugins': '/help/plugins',