Add shared template infrastructure and static assets:
- Shared Jinja2 templates for reusable components
- Favicon for branding
- Local Tailwind CSS fallback
- Shop CSS styles directory
This provides the foundation for consistent UI components across
admin, vendor, and shop frontends with CDN fallback support.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
