Standardize API response envelopes: use items for collection responses and update tests

backend/tests/test_services/test_config_service.py

@@ -220,7 +220,7 @@ class TestListJailConfigs:
 
         assert isinstance(result, JailConfigListResponse)
         assert result.total == 1
-        assert result.jails[0].name == "sshd"
+        assert result.items[0].name == "sshd"
 
     async def test_empty_when_no_jails(self) -> None:
         """list_jail_configs returns empty list when no jails are active."""
@@ -229,7 +229,7 @@ class TestListJailConfigs:
             result = await config_service.list_jail_configs(_SOCKET)
 
         assert result.total == 0
-        assert result.jails == []
+        assert result.items == []
 
     async def test_multiple_jails(self) -> None:
         """list_jail_configs handles comma-separated jail names."""
@@ -245,7 +245,7 @@ class TestListJailConfigs:
             result = await config_service.list_jail_configs(_SOCKET)
 
         assert result.total == 2
-        names = {j.name for j in result.jails}
+        names = {j.name for j in result.items}
         assert names == {"sshd", "nginx"}
 
 
@@ -887,7 +887,7 @@ class TestConfigModuleIntegration:
         ):
             result = await list_inactive_jails(str(tmp_path), "/fake.sock")
 
-        names = {j.name for j in result.jails}
+        names = {j.name for j in result.items}
         assert "apache-auth" in names
         assert "sshd" not in names