feat: Add Docker support and health endpoint

- Add production-ready Dockerfile with multi-stage build
- Add .dockerignore for optimized builds
- Add docker-compose.yml for easy deployment
- Add /health endpoint for container health checks
- Update README with comprehensive Docker documentation
- Include security best practices (non-root user, health checks)
- Support for both development and production deployments

src/server/index.ts

@@ -11,6 +11,11 @@ app.use("*", async (c, next) => {
   return next();
 });
 
+// Health check endpoint
+app.get("/health", (c) => {
+  return c.json({ status: "ok", timestamp: new Date().toISOString() });
+});
+
 app.route("/rpc", rpcApp);
 app.get("/*", clientEntry);