feat: add memory-efficient rate-limit pruning and remove unused worker file from image

Dockerfile

@@ -30,7 +30,6 @@ WORKDIR /home/node/app
 
 COPY --chown=node:node health-server.js /home/node/app/health-server.js
 COPY --chown=node:node cloudflare-proxy.js /opt/cloudflare-proxy.js
-COPY --chown=node:node cloudflare-worker.js /home/node/app/cloudflare-worker.js
 COPY --chown=node:node cloudflare-proxy-setup.py /home/node/app/cloudflare-proxy-setup.py
 
 # Set NODE_OPTIONS after preload scripts are copied

health-server.js

@@ -78,6 +78,14 @@ function isRateLimited(req) {
   return recent.length > UPTIMEROBOT_RATE_MAX;
 }
 
+// Prune stale rate-limit buckets every 5 minutes to prevent unbounded growth.
+setInterval(() => {
+  const cutoff = Date.now() - UPTIMEROBOT_RATE_WINDOW_MS;
+  for (const [ip, timestamps] of uptimerobotRateMap) {
+    if (timestamps.every((ts) => ts < cutoff)) uptimerobotRateMap.delete(ip);
+  }
+}, 5 * 60 * 1000).unref();
+
 function isAllowedUptimeSetupOrigin(req) {
   const host = String(req.headers.host || "").toLowerCase();
   const origin = String(req.headers.origin || "").toLowerCase();