Add Node.js implementation with enhanced search capabilities

- Implement complete Express.js server with SQLite FTS5 search
- Add modern responsive UI with dark/light themes
- Enhance search with partial word matching and advanced filters
- Add RESTful API with comprehensive endpoints
- Include security features (Helmet.js, rate limiting, CORS)
- Add performance optimizations (gzip, caching, WAL mode)
- Provide comprehensive documentation and setup scripts
- Maintain feature parity with Python implementation while adding enhancements

.gitignore-nodejs

@@ -0,0 +1,79 @@
+# Node.js dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Database files
+database/
+*.db
+*.db-wal
+*.db-shm
+
+# Environment files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Logs
+logs/
+*.log
+
+# Runtime data
+pids/
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# nyc test coverage
+.nyc_output/
+
+# Dependency directories
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Temporary files
+tmp/
+temp/