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

Dockerfile

@@ -0,0 +1,23 @@
+# Use Node.js 20 as the base image
+FROM node:20-slim
+
+# Install curl for healthcheck
+RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy source code first
+COPY . .
+
+# Install dependencies
+RUN npm install
+
+# Build TypeScript
+RUN npm run build
+
+# Expose the port the app runs on
+EXPOSE 3000
+
+# Start the application
+CMD ["node", "dist/src/index.js"]