feat(PortProxy): Add feature to preserve original client IP through chained proxies

test/test.portproxy.ts

@@ -175,6 +175,37 @@ tap.test('should stop port proxy', async () => {
 });
 
 // Cleanup
+tap.test('should preserve client IP through chained proxies', async () => {
+  // Create two proxies in chain
+  const firstProxy = new PortProxy({
+    fromPort: PROXY_PORT + 4,
+    toPort: PROXY_PORT + 5,  // Point to second proxy
+    toHost: 'localhost',
+    domains: [],
+    sniEnabled: false,
+    defaultAllowedIPs: ['127.0.0.1']
+  });
+
+  const secondProxy = new PortProxy({
+    fromPort: PROXY_PORT + 5,
+    toPort: TEST_SERVER_PORT,
+    toHost: 'localhost',
+    domains: [],
+    sniEnabled: false,
+    defaultAllowedIPs: ['127.0.0.1']
+  });
+
+  await secondProxy.start();
+  await firstProxy.start();
+
+  // Connect through the chain
+  const response = await createTestClient(PROXY_PORT + 4, TEST_DATA);
+  expect(response).toEqual(`Echo: ${TEST_DATA}`);
+
+  await firstProxy.stop();
+  await secondProxy.stop();
+});
+
 tap.test('cleanup port proxy test environment', async () => {
   await new Promise<void>((resolve) => testServer.close(() => resolve()));
 });