fix: 修复员工服务、报销单审批及前端交互细节

- 修复员工创建时组织架构关联与邮箱校验逻辑
- 修复报销单API端点参数及预审流程调用
- 优化审批中心、差旅详情等前端页面交互
- 更新侧边栏导航与请求视图模型
- 补充员工服务与报销单相关测试用例

server/tests/test_employee_service.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from datetime import UTC, datetime
+
 import pytest
 from sqlalchemy import create_engine, func, select
 from sqlalchemy.orm import Session, sessionmaker
@@ -241,6 +243,14 @@ def test_update_employee_changes_manager() -> None:
         assert updated.manager == manager.name
 
 
+def test_format_history_datetime_uses_local_timezone_without_seconds() -> None:
+    value = datetime(2026, 5, 20, 6, 30, 45, tzinfo=UTC)
+    formatted = EmployeeService._format_history_datetime(value)
+
+    assert formatted == "2026年5月20日14时30分"
+    assert "秒" not in formatted
+
+
 def test_update_employee_rejects_invalid_date_format() -> None:
     with build_session() as db:
         service = EmployeeService(db)