fix: add missing commas for syntax correctness across multiple files

tests/services/test_activity_service.py

@@ -98,7 +98,7 @@ async def test_list_activities_returns_only_current_deal(session: AsyncSession)
                 payload={"text": "hi"},
             ),
             Activity(
-                deal_id=deal_id + 1, author_id=context.user_id, type=ActivityType.SYSTEM, payload={}
+                deal_id=deal_id + 1, author_id=context.user_id, type=ActivityType.SYSTEM, payload={},
             ),
         ],
     )
@@ -120,7 +120,7 @@ async def test_add_comment_rejects_empty_text(session: AsyncSession) -> None:
 
     with pytest.raises(ActivityValidationError):
         await service.add_comment(
-            deal_id=deal_id, author_id=context.user_id, text="   ", context=context
+            deal_id=deal_id, author_id=context.user_id, text="   ", context=context,
         )