feat: 增强员工管理与报销单全流程功能

- 新增员工Excel导入服务(employee_spreadsheet)及导入/导出API端点
- 员工服务增加批量创建、邮箱唯一校验、组织架构关联等能力
- 报销单提交补充身份回填、部门信息透传及预审结果展示优化
- 认证流程增加部门信息(departmentName)并在schema中同步扩展
- 用户Agent服务增加部门关联与报销单回填逻辑
- 前端员工管理页面全面重构，新增导入导出、搜索过滤、分页等功能
- 前端审批中心、审计、差旅报销等视图交互与样式优化
- 新增TableLoadingState共享组件及员工导入测试用例

server/src/app/api/v1/endpoints/employees.py

@@ -2,12 +2,19 @@ from __future__ import annotations
 
 from typing import Annotated
 
-from fastapi import APIRouter, Depends, HTTPException, Query, status
+from fastapi import APIRouter, Depends, File, HTTPException, Query, UploadFile, status
+from fastapi.responses import Response
 from sqlalchemy.orm import Session
 
 from app.api.deps import get_db
 from app.schemas.common import ErrorResponse
-from app.schemas.employee import EmployeeCreate, EmployeeMetaRead, EmployeeRead, EmployeeUpdate
+from app.schemas.employee import (
+    EmployeeCreate,
+    EmployeeImportResultRead,
+    EmployeeMetaRead,
+    EmployeeRead,
+    EmployeeUpdate,
+)
 from app.services.employee import EmployeeService
 
 router = APIRouter()
@@ -44,6 +51,67 @@ def list_employees(
     return EmployeeService(db).list_employees(status=status_filter, keyword=keyword)
 
 
+@router.get(
+    "/import-template",
+    summary="下载员工导入模板",
+    description="下载固定格式的员工 Excel 导入模板。",
+)
+def download_employee_import_template(db: DbSession) -> Response:
+    content = EmployeeService(db).build_import_template()
+    return Response(
+        content=content,
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={
+            "Content-Disposition": 'attachment; filename="employee-import-template.xlsx"'
+        },
+    )
+
+
+@router.get(
+    "/export",
+    summary="导出员工 Excel",
+    description="按筛选条件导出员工目录 Excel 文件。",
+)
+def export_employees(
+    db: DbSession,
+    status_filter: Annotated[
+        str | None,
+        Query(alias="status", description="员工状态筛选值。"),
+    ] = None,
+    keyword: Annotated[
+        str | None,
+        Query(description="姓名、工号、邮箱等关键字模糊查询。"),
+    ] = None,
+) -> Response:
+    content = EmployeeService(db).export_employees(status=status_filter, keyword=keyword)
+    return Response(
+        content=content,
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={"Content-Disposition": 'attachment; filename="employee-export.xlsx"'},
+    )
+
+
+@router.post(
+    "/import",
+    response_model=EmployeeImportResultRead,
+    summary="导入员工 Excel",
+    description="按模板批量导入员工。全部校验通过后才写入数据库，任一行有错则整批不导入。",
+)
+async def import_employees(
+    db: DbSession,
+    file: Annotated[UploadFile, File(description="待导入的员工 Excel 文件。")],
+) -> EmployeeImportResultRead:
+    filename = (file.filename or "").lower()
+    if not filename.endswith(".xlsx"):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="当前仅支持上传 .xlsx 格式的员工表格。",
+        )
+
+    content = await file.read()
+    return EmployeeService(db).import_employees(content)
+
+
 @router.post(
     "",
     response_model=EmployeeRead,