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

src/security/index.ts

@@ -127,6 +127,11 @@ export class TokenManager {
 
 // Request validation middleware
 export function validateRequest(req: Request, res: Response, next: NextFunction) {
+    // Skip validation for health endpoint
+    if (req.path === '/health') {
+        return next();
+    }
+
     // Validate content type
     if (req.method !== 'GET' && !req.is('application/json')) {
         return res.status(415).json({