Add Docker support and enhance server configuration

- Created Dockerfile for containerized deployment
- Added .dockerignore to optimize Docker build context
- Updated README with comprehensive Docker setup instructions
- Implemented new server endpoints:
  * Health check endpoint
  * Device listing
  * Device control
  * SSE event subscription
- Enhanced security middleware with request validation and input sanitization
- Added error handling and token-based authentication for new endpoints

.dockerignore

@@ -0,0 +1,31 @@
+# Dependencies
+node_modules
+npm-debug.log
+yarn-debug.log
+yarn-error.log
+
+# Build output
+dist
+
+# Environment files
+.env*
+!.env.example
+
+# Git
+.git
+.gitignore
+
+# IDE
+.vscode
+.idea
+
+# Test files
+coverage
+__tests__
+jest.config.*
+*.test.ts
+
+# Misc
+*.md
+.DS_Store
+*.log