fix(acme): Fix port 80 ACME management and challenge route concurrency issues by deduplicating port listeners, preserving challenge route state across certificate manager recreations, and adding mutex locks to route updates.

ts/proxies/smart-proxy/utils/mutex.ts

@@ -0,0 +1,45 @@
+/**
+ * Simple mutex implementation for async operations
+ */
+export class Mutex {
+  private isLocked: boolean = false;
+  private waitQueue: Array<() => void> = [];
+
+  /**
+   * Acquire the lock
+   */
+  async acquire(): Promise<void> {
+    return new Promise<void>((resolve) => {
+      if (!this.isLocked) {
+        this.isLocked = true;
+        resolve();
+      } else {
+        this.waitQueue.push(resolve);
+      }
+    });
+  }
+
+  /**
+   * Release the lock
+   */
+  release(): void {
+    this.isLocked = false;
+    const nextResolve = this.waitQueue.shift();
+    if (nextResolve) {
+      this.isLocked = true;
+      nextResolve();
+    }
+  }
+
+  /**
+   * Run a function exclusively with the lock
+   */
+  async runExclusive<T>(fn: () => Promise<T>): Promise<T> {
+    await this.acquire();
+    try {
+      return await fn();
+    } finally {
+      this.release();
+    }
+  }
+}