finalize medical consultation agent backend

backend/app/repositories/source_case_repository.py

@@ -50,7 +50,7 @@ class SourceCaseRepository:
         return self.db.scalar(stmt)
 
     def get_department_name(self, department_id: int | None) -> str:
-        """科室名称：兼容当前 demo 的 departments 表，源库无科室表时返回空字符串。"""
+        """科室名称：按用户端 department 表读取科室名称。"""
         if not department_id:
             return ""
         department = self.db.scalar(select(Department).where(Department.id == department_id))