fix: 修复flake8 lint检查错误

- 删除废弃的 admin_positions_backup.py 备份文件
- 修复 courses.py 缺失的 select 导入
- 修复 coze_gateway.py 异常变量作用域问题
- 修复 scheduler_service.py 无用的 global 声明
- 添加 TYPE_CHECKING 导入解决模型前向引用警告

backend/app/api/v1/admin_positions_backup.py

@@ -1,158 +0,0 @@
-# 此文件备份了admin.py中的positions相关路由代码
-# 这些路由已移至positions.py，为避免冲突，从admin.py中移除
-
-@router.get("/positions")
-async def list_positions(
-    keyword: Optional[str] = Query(None, description="关键词"),
-    page: int = Query(1, ge=1),
-    pageSize: int = Query(20, ge=1, le=100),
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    """
-    获取岗位列表（stub 数据）
-
-    返回结构兼容前端：data.list/total/page/pageSize
-    """
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    try:
-        items = _sample_positions()
-        if keyword:
-            kw = keyword.lower()
-            items = [
-                p for p in items if kw in (p.get("name", "") + p.get("description", "")).lower()
-            ]
-
-        total = len(items)
-        start = (page - 1) * pageSize
-        end = start + pageSize
-        page_items = items[start:end]
-
-        return ResponseModel(
-            code=200,
-            message="获取岗位列表成功",
-            data={
-                "list": page_items,
-                "total": total,
-                "page": page,
-                "pageSize": pageSize,
-            },
-        )
-    except Exception as exc:
-        # 记录错误堆栈由全局异常中间件处理；此处返回统一结构
-        return ResponseModel(code=500, message=f"服务器错误：{exc}")
-
-
-@router.get("/positions/tree")
-async def get_position_tree(
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    """
-    获取岗位树（stub 数据）
-    """
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    try:
-        items = _sample_positions()
-        id_to_node: Dict[int, Dict[str, Any]] = {}
-        for p in items:
-            node = {**p, "children": []}
-            id_to_node[p["id"]] = node
-
-        roots: List[Dict[str, Any]] = []
-        for p in items:
-            parent_id = p.get("parentId")
-            if parent_id and parent_id in id_to_node:
-                id_to_node[parent_id]["children"].append(id_to_node[p["id"]])
-            else:
-                roots.append(id_to_node[p["id"]])
-
-        return ResponseModel(code=200, message="获取岗位树成功", data=roots)
-    except Exception as exc:
-        return ResponseModel(code=500, message=f"服务器错误：{exc}")
-
-
-@router.get("/positions/{position_id}")
-async def get_position_detail(
-    position_id: int,
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    items = _sample_positions()
-    for p in items:
-        if p["id"] == position_id:
-            return ResponseModel(code=200, message="获取岗位详情成功", data=p)
-    return ResponseModel(code=404, message="岗位不存在")
-
-
-@router.get("/positions/{position_id}/check-delete")
-async def check_position_delete(
-    position_id: int,
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    # stub：允许删除非根岗位
-    deletable = position_id != 1
-    reason = "根岗位不允许删除" if not deletable else ""
-    return ResponseModel(code=200, message="检查成功", data={"deletable": deletable, "reason": reason})
-
-
-@router.post("/positions")
-async def create_position(
-    payload: Dict[str, Any],
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    # stub：直接回显并附带一个伪ID
-    payload = dict(payload)
-    payload.setdefault("id", 999)
-    payload.setdefault("createTime", datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
-    return ResponseModel(code=200, message="创建岗位成功", data=payload)
-
-
-@router.put("/positions/{position_id}")
-async def update_position(
-    position_id: int,
-    payload: Dict[str, Any],
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    # stub：直接回显
-    updated = {"id": position_id, **payload}
-    return ResponseModel(code=200, message="更新岗位成功", data=updated)
-
-
-@router.delete("/positions/{position_id}")
-async def delete_position(
-    position_id: int,
-    current_user: User = Depends(get_current_user),
-    _db: AsyncSession = Depends(get_db),
-) -> ResponseModel:
-    not_admin = _ensure_admin(current_user)
-    if not_admin:
-        return not_admin
-
-    # stub：直接返回成功
-    return ResponseModel(code=200, message="删除岗位成功", data={"id": position_id})

backend/app/api/v1/courses.py

@@ -4,6 +4,7 @@
 from typing import List, Optional
 
 from fastapi import APIRouter, Depends, Query, status, BackgroundTasks, Request
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.deps import get_db, get_current_user, require_admin, require_admin_or_manager, User

backend/app/api/v1/coze_gateway.py

@@ -203,25 +203,29 @@ async def send_message(request: SendMessageRequest, user=Depends(get_current_use
                 },
             }
 
-    except CozeException as e:
-        logger.error(f"发送消息失败: {e}")
+    except CozeException as coze_err:
+        logger.error(f"发送消息失败: {coze_err}")
         if request.stream:
-            # 流式响应的错误处理
+            # 流式响应的错误处理 - 捕获异常信息避免闭包问题
+            err_code = coze_err.code
+            err_message = coze_err.message
+            err_details = coze_err.details
+
             async def error_generator():
                 yield {
                     "event": "error",
                     "data": {
-                        "code": e.code,
-                        "message": e.message,
-                        "details": e.details,
+                        "code": err_code,
+                        "message": err_message,
+                        "details": err_details,
                     },
                 }
 
             return EventSourceResponse(error_generator())
         else:
             raise HTTPException(
-                status_code=e.status_code or 500,
-                detail={"code": e.code, "message": e.message, "details": e.details},
+                status_code=coze_err.status_code or 500,
+                detail={"code": err_code, "message": err_message, "details": err_details},
             )
     except Exception as e:
         logger.error(f"未知错误: {e}", exc_info=True)

backend/app/models/course.py

@@ -2,9 +2,12 @@
 课程相关数据库模型
 """
 from enum import Enum
-from typing import List, Optional
+from typing import List, Optional, TYPE_CHECKING
 from datetime import datetime
 
+if TYPE_CHECKING:
+    from app.models.growth_path import GrowthPathNode
+
 from sqlalchemy import (
     String,
     Text,

backend/app/models/growth_path.py

@@ -2,10 +2,14 @@
 成长路径相关数据库模型
 """
 from enum import Enum
-from typing import List, Optional
+from typing import List, Optional, TYPE_CHECKING
 from datetime import datetime
 from decimal import Decimal
 
+if TYPE_CHECKING:
+    from app.models.course import Course
+    from app.models.user import User
+
 from sqlalchemy import (
     String,
     Text,
@@ -84,7 +88,7 @@ class GrowthPathNode(BaseModel, SoftDeleteMixin):
     )
 
     # 关联关系
-    growth_path: Mapped["GrowthPath"] = relationship(
+    growth_path: Mapped["GrowthPath"] = relationship(  # noqa: F821
         "GrowthPath", back_populates="nodes"
     )
     course: Mapped["Course"] = relationship("Course")
@@ -146,7 +150,7 @@ class UserGrowthPathProgress(BaseModel):
 
     # 关联关系
     user: Mapped["User"] = relationship("User")
-    growth_path: Mapped["GrowthPath"] = relationship("GrowthPath")
+    growth_path: Mapped["GrowthPath"] = relationship("GrowthPath")  # noqa: F821
 
 
 class UserNodeCompletion(BaseModel):
@@ -203,4 +207,4 @@ class UserNodeCompletion(BaseModel):
     node: Mapped["GrowthPathNode"] = relationship(
         "GrowthPathNode", back_populates="user_completions"
     )
-    growth_path: Mapped["GrowthPath"] = relationship("GrowthPath")
+    growth_path: Mapped["GrowthPath"] = relationship("GrowthPath")  # noqa: F821

backend/app/services/scheduler_service.py

@@ -261,8 +261,6 @@ def start_scheduler():
 
 def stop_scheduler():
     """停止调度器"""
-    global scheduler
-    
     if scheduler and scheduler.running:
         scheduler.shutdown()
         logger.info("定时任务调度器已停止")