修复前后端显示异常问题（受试者、中心、负责人、日期等）

backend/app/api/v1/members.py

@@ -6,7 +6,9 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.core.deps import get_db_session, require_study_member, require_study_roles
 from app.crud import member as member_crud
 from app.crud import study as study_crud
-from app.schemas.member import StudyMemberCreate, StudyMemberRead, StudyMemberUpdate
+from app.crud import user as user_crud
+from app.schemas.member import StudyMemberCreate, StudyMemberRead, StudyMemberReadWithUser, StudyMemberUpdate
+from app.schemas.user import UserDisplay
 
 router = APIRouter()
 
@@ -39,7 +41,7 @@ async def add_member(
 
 @router.get(
     "/",
-    response_model=list[StudyMemberRead],
+    response_model=list[StudyMemberReadWithUser],
     dependencies=[Depends(require_study_member())],
 )
 async def list_members(
@@ -47,10 +49,31 @@ async def list_members(
     skip: int = 0,
     limit: int = 100,
     db: AsyncSession = Depends(get_db_session),
-) -> list[StudyMemberRead]:
+) -> list[StudyMemberReadWithUser]:
     await _ensure_study_exists(db, study_id)
     members = await member_crud.list_members(db, study_id, skip=skip, limit=limit)
-    return list(members)
+    user_ids = {m.user_id for m in members}
+    users_map = await user_crud.get_users_by_ids(db, user_ids)
+    result: list[StudyMemberReadWithUser] = []
+    for m in members:
+        # 仅返回项目内启用的成员 + 账号启用的用户
+        if not m.is_active:
+            continue
+        user = users_map.get(m.user_id)
+        if not user or not user.is_active:
+            continue
+        result.append(
+            StudyMemberReadWithUser(
+                id=m.id,
+                study_id=m.study_id,
+                user_id=m.user_id,
+                role_in_study=m.role_in_study,
+                is_active=m.is_active,
+                added_at=m.added_at,
+                user=UserDisplay.model_validate(user) if user else None,
+            )
+        )
+    return result
 
 
 @router.patch(