Backend changes:
- Add tinypdf-plus dependency for TTF/OTF font support
- Create PDF service with text, certificate, and label generation
- Add PDF API endpoints (/api/pdf/*)
- Add branding service for custom fonts and styling
- Add branding API endpoints (/api/branding/*)
- Add font registration endpoint for custom fonts
Frontend changes:
- Add PDF library with download utilities
- Add PDFDownloadButton component for reusable PDF downloads
- Add branding API client for managing branding configs
- Update ReportsPage with PDF generation tab
Co-Authored-By: Claude <noreply@anthropic.com>
