Add Docker deployment support and PWA enhancements

- Add Dockerfile with multi-stage build (Node.js + Nginx)
- Add docker-compose.yml for Portainer stack deployment on port 7777
- Add nginx.conf with PWA support, gzip compression, and security headers
- Add .dockerignore for optimized Docker builds
- Add DEPLOYMENT.md with comprehensive deployment guide
- Configure Vite PWA plugin with service worker and offline support
- Add PWA manifest.json with app icons and shortcuts
- Enhance logo.svg with iOS-style glass effects (filters, gradients, highlights)
- Add app-icon.svg for PWA installation
- Update mobile nav with glassmorphic active tab styling
- Fix mobile tab bar layout shift issues with flex-1 and consistent sizing
- Update index.html with PWA meta tags and Apple-specific settings
- Add health check endpoint at /health for container monitoring

Co-authored-by: Cursor <cursoragent@cursor.com>

.dockerignore

@@ -0,0 +1,20 @@
+node_modules
+dist
+.git
+.gitignore
+README.md
+.env
+.env.local
+.env.*.local
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+.DS_Store
+*.local
+.vscode
+.idea
+*.swp
+*.swo
+*~
+.cursor