prepare fastapi root layout for server deployment

app/api/cases.py

@@ -0,0 +1,59 @@
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.orm import Session
+
+from app.core.response import ApiResponse, ok
+from app.core.user_context import UserContext, get_user_context
+from app.db.session import get_db
+from app.schemas.case import (
+    CaseDeletePreviewResponse,
+    CaseDeleteRequest,
+    CaseDeleteResponse,
+    CaseDetailResponse,
+    CaseListResponse,
+)
+from app.services.case_service import CaseService
+
+router = APIRouter()
+
+
+@router.get("", response_model=ApiResponse[CaseListResponse])
+def list_cases(
+    _: UserContext = Depends(get_user_context),
+    db: Session = Depends(get_db),
+    department_id: int | None = Query(default=None),
+    training_type: str | None = Query(default=None),
+    mode: str | None = Query(default=None),
+):
+    """病例列表：返回当前可用的激活病例，不暴露标准答案。"""
+    return ok(CaseService(db).list_cases(department_id=department_id, training_type=training_type, mode=mode))
+
+
+@router.get("/{case_id}", response_model=ApiResponse[CaseDetailResponse])
+def get_case_detail(
+    case_id: int,
+    _: UserContext = Depends(get_user_context),
+    db: Session = Depends(get_db),
+):
+    """病例详情：返回训练入口信息和可申请检查类型。"""
+    return ok(CaseService(db).get_case_detail(case_id))
+
+
+@router.get("/{case_id}/delete-preview", response_model=ApiResponse[CaseDeletePreviewResponse])
+def get_case_delete_preview(
+    case_id: int,
+    _: UserContext = Depends(get_user_context),
+    db: Session = Depends(get_db),
+):
+    """病例删除预览：返回删除该病例会影响的训练与病例数据数量。"""
+    return ok(CaseService(db).get_delete_preview(case_id))
+
+
+@router.delete("/{case_id}", response_model=ApiResponse[CaseDeleteResponse])
+def delete_case(
+    case_id: int,
+    payload: CaseDeleteRequest,
+    ctx: UserContext = Depends(get_user_context),
+    db: Session = Depends(get_db),
+):
+    """病例删除：确认后级联删除病例、扩展表、评分规则、检查项和关联训练数据。"""
+    return ok(CaseService(db).delete_case(case_id, payload, ctx))