wip(handoff): restore backend suite to green

Co-Authored-By: Codex <noreply@openai.com>

backend/tests/test_ai_endpoints.py

@@ -74,19 +74,25 @@ def _mock_ai_provider(text: str, input_tokens: int = 100, output_tokens: int = 2
 @pytest.fixture
 def enable_ai():
     """Temporarily enable AI by setting a fake API key."""
-    original = settings.ANTHROPIC_API_KEY
+    original_anthropic = settings.ANTHROPIC_API_KEY
+    original_google = settings.GOOGLE_AI_API_KEY
     settings.ANTHROPIC_API_KEY = "test-key-fake"
+    settings.GOOGLE_AI_API_KEY = None
     yield
-    settings.ANTHROPIC_API_KEY = original
+    settings.ANTHROPIC_API_KEY = original_anthropic
+    settings.GOOGLE_AI_API_KEY = original_google
 
 
 @pytest.fixture
 def disable_ai():
     """Ensure AI is disabled."""
-    original = settings.ANTHROPIC_API_KEY
+    original_anthropic = settings.ANTHROPIC_API_KEY
+    original_google = settings.GOOGLE_AI_API_KEY
     settings.ANTHROPIC_API_KEY = None
+    settings.GOOGLE_AI_API_KEY = None
     yield
-    settings.ANTHROPIC_API_KEY = original
+    settings.ANTHROPIC_API_KEY = original_anthropic
+    settings.GOOGLE_AI_API_KEY = original_google
 
 
 # ── Quota endpoint ──