feat: enhance service discovery and proxy management

backend/tests/integrations/test_docker_ports.py

@@ -0,0 +1,30 @@
+from integrations.docker.ports import _get_service_binding, _replace_port_in_mapping
+
+
+def test_get_service_binding_includes_loopback_hosts():
+    assert _get_service_binding("127.0.0.1:8080:80") == (8080, "127.0.0.1")
+    assert _get_service_binding("localhost:9081:5678") == (9081, "localhost")
+
+
+def test_replace_port_in_mapping_can_force_loopback_host():
+    updated = _replace_port_in_mapping(
+        "9081:5678",
+        9081,
+        54001,
+        host_to="127.0.0.1",
+        rewrite_host=True,
+    )
+
+    assert updated == "127.0.0.1:54001:5678"
+
+
+def test_replace_port_in_mapping_can_restore_unspecified_host():
+    restored = _replace_port_in_mapping(
+        "127.0.0.1:54001:5678",
+        54001,
+        9081,
+        host_to=None,
+        rewrite_host=True,
+    )
+
+    assert restored == "9081:5678"