test: use tmp_path for _user_db_path tests; remove duplicate comment

Patch _user_db_path tests to monkeypatch CLOUD_DATA_ROOT onto a
tmp_path so they never touch /devl or any real filesystem path.
Remove duplicate X-Real-IP comment block in cloud_session.get_session.

app/cloud_session.py

@@ -208,8 +208,6 @@ def get_session(request: Request) -> CloudUser:
     if not CLOUD_MODE:
         return CloudUser(user_id="local", tier="local", db=_LOCAL_KIWI_DB, has_byok=has_byok)
 
-    # Prefer X-Real-IP (set by nginx from the actual client address) over the
-    # TCP peer address (which is nginx's container IP when behind the proxy).
     # Prefer X-Real-IP (set by nginx from the actual client address) over the
     # TCP peer address (which is nginx's container IP when behind the proxy).
     client_ip = (

tests/test_household.py

@@ -6,10 +6,10 @@ import pytest
 
 os.environ.setdefault("CLOUD_MODE", "false")
 
+import app.cloud_session as cs
 from app.cloud_session import (
     CloudUser,
     _user_db_path,
-    CLOUD_DATA_ROOT,
 )
 
 
@@ -28,11 +28,13 @@ def test_clouduser_household_defaults_none():
     assert u.is_household_owner is False
 
 
-def test_user_db_path_personal():
-    path = _user_db_path("abc123", household_id=None)
-    assert path == CLOUD_DATA_ROOT / "abc123" / "kiwi.db"
+def test_user_db_path_personal(tmp_path, monkeypatch):
+    monkeypatch.setattr(cs, "CLOUD_DATA_ROOT", tmp_path)
+    result = cs._user_db_path("abc123")
+    assert result == tmp_path / "abc123" / "kiwi.db"
 
 
-def test_user_db_path_household():
-    path = _user_db_path("abc123", household_id="hh-xyz")
-    assert path == CLOUD_DATA_ROOT / "household_hh-xyz" / "kiwi.db"
+def test_user_db_path_household(tmp_path, monkeypatch):
+    monkeypatch.setattr(cs, "CLOUD_DATA_ROOT", tmp_path)
+    result = cs._user_db_path("abc123", household_id="hh-xyz")
+    assert result == tmp_path / "household_hh-xyz" / "kiwi.db"