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>