chore: finalize backend feature scope

app/repositories/case_repository.py

@@ -1,7 +1,7 @@
-from sqlalchemy import exists, select
+from sqlalchemy import select
 from sqlalchemy.orm import Session, selectinload
 
-from app.models.source_case import CaseBase, CaseExamItem, TeachingCase, TraditionalCase
+from app.models.source_case import CaseBase, CaseExamItem
 
 
 class CaseRepository:
@@ -10,31 +10,8 @@ class CaseRepository:
     def __init__(self, db: Session) -> None:
         self.db = db
 
-    def list_active_cases(
-        self,
-        department_id: int | None = None,
-        training_type: str | None = None,
-        mode: str | None = None,
-    ) -> list[CaseBase]:
-        """病例列表：从 case_base 读取已发布病例，并按模式匹配扩展表。"""
-        normalized_mode = "practice" if mode == "novice" else mode
-        stmt = (
-            select(CaseBase)
-            .options(selectinload(CaseBase.traditional_case), selectinload(CaseBase.teaching_case))
-            .where(CaseBase.status == 1, CaseBase.publish_status == 1)
-        )
-        if department_id:
-            stmt = stmt.where(CaseBase.department_id == department_id)
-        if training_type:
-            stmt = stmt.where(CaseBase.case_type == training_type)
-        if normalized_mode == "practice":
-            stmt = stmt.where(exists().where(TraditionalCase.case_id == CaseBase.id))
-        if normalized_mode == "teaching":
-            stmt = stmt.where(exists().where(TeachingCase.case_id == CaseBase.id))
-        return list(self.db.scalars(stmt.order_by(CaseBase.id.desc())).all())
-
     def get_active_case(self, case_id: int) -> CaseBase | None:
-        """病例详情：读取病例主表及训练所需的扩展表、评分规则和检查项目。"""
+        """病例读取：读取病例主表及训练所需的扩展表、评分规则和检查项目。"""
         stmt = (
             select(CaseBase)
             .options(