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>

nginx.conf

@@ -0,0 +1,58 @@
+server {
+    listen 7777;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "no-referrer-when-downgrade" always;
+
+    # PWA Support - proper MIME types
+    location ~* \.(?:manifest|webmanifest|json)$ {
+        add_header Cache-Control "public, max-age=3600";
+        add_header Content-Type application/manifest+json;
+    }
+
+    location ~* \.(?:js|css|woff2|woff|ttf|otf|eot|svg|png|jpg|jpeg|gif|ico)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Vue Router - SPA fallback
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Service Worker
+    location /sw.js {
+        add_header Cache-Control "no-cache";
+        proxy_cache_bypass $http_pragma;
+        proxy_cache_revalidate on;
+        expires off;
+        access_log off;
+    }
+
+    location /workbox-*.js {
+        add_header Cache-Control "no-cache";
+        proxy_cache_bypass $http_pragma;
+        proxy_cache_revalidate on;
+        expires off;
+        access_log off;
+    }
+
+    # Health check endpoint
+    location /health {
+        access_log off;
+        return 200 "healthy\n";
+        add_header Content-Type text/plain;
+    }
+}