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>

docker-compose.yml

@@ -0,0 +1,28 @@
+version: '3.8'
+
+services:
+  indeedhub:
+    image: indeedhub-prototype:latest
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: indeedhub-app
+    restart: unless-stopped
+    ports:
+      - "7777:7777"
+    environment:
+      - NODE_ENV=production
+    networks:
+      - indeedhub-network
+    labels:
+      - "com.centurylinklabs.watchtower.enable=true"
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:7777/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+networks:
+  indeedhub-network:
+    driver: bridge