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/src/app/services/employee.py

@@ -1,8 +1,9 @@
 from __future__ import annotations
 
 from collections import Counter
-from datetime import date, datetime
+from datetime import UTC, date, datetime
 from typing import Any
+from zoneinfo import ZoneInfo
 
 from sqlalchemy import inspect, select, text
 from sqlalchemy.orm import Session
@@ -49,6 +50,7 @@ from app.services.employee_seed import (
 logger = get_logger("app.services.employee")
 DEFAULT_EMPLOYEE_PASSWORD = "123456"
 MAX_EMPLOYEE_CHANGE_LOGS = 5
+DISPLAY_TIMEZONE = ZoneInfo("Asia/Shanghai")
 
 STATUS_TONE_MAP = {
     "在职": "success",
@@ -183,7 +185,7 @@ class EmployeeService:
             sync_state=payload.sync_state,
             spotlight=payload.spotlight,
             password_hash=hash_password(DEFAULT_EMPLOYEE_PASSWORD),
-            last_sync_at=datetime.now(),
+            last_sync_at=datetime.now(UTC),
         )
 
         if payload.organization_unit_code:
@@ -360,7 +362,7 @@ class EmployeeService:
         if not changed_fields and not password_changed and not role_changed:
             return self._serialize_employee(employee)
 
-        now = datetime.now()
+        now = datetime.now(UTC)
         employee.last_sync_at = now
         employee.sync_state = "已同步"
 
@@ -401,7 +403,7 @@ class EmployeeService:
         if employee.employment_status == "停用":
             return self._serialize_employee(employee)
 
-        now = datetime.now()
+        now = datetime.now(UTC)
         employee.employment_status = "停用"
         employee.sync_state = "已同步"
         employee.last_sync_at = now
@@ -422,7 +424,7 @@ class EmployeeService:
         if employee.employment_status != "停用":
             return self._serialize_employee(employee)
 
-        now = datetime.now()
+        now = datetime.now(UTC)
         employee.employment_status = "在职"
         employee.sync_state = "已同步"
         employee.last_sync_at = now
@@ -484,7 +486,7 @@ class EmployeeService:
             logger.exception("Employee import failed during database write")
             raise
 
-        imported_at = self._format_datetime(datetime.now()) or ""
+        imported_at = self._format_datetime(datetime.now(UTC)) or ""
         message = f"导入成功：新增 {summary['created']} 人，更新 {summary['updated']} 人。"
         logger.info(
             "Imported employees created=%d updated=%d total=%d",
@@ -624,7 +626,7 @@ class EmployeeService:
         }
         created = 0
         updated = 0
-        now = datetime.now()
+        now = datetime.now(UTC)
 
         try:
             for row in rows:
@@ -979,7 +981,7 @@ class EmployeeService:
                 employee=employee,
                 action=action,
                 owner=owner,
-                occurred_at=occurred_at or datetime.now(),
+                occurred_at=occurred_at or datetime.now(UTC),
             )
         )
 
@@ -1106,19 +1108,29 @@ class EmployeeService:
             return None
         return value.strftime("%Y-%m-%d")
 
+    @staticmethod
+    def _to_display_datetime(value: datetime) -> datetime:
+        if value.tzinfo is None:
+            normalized = value.replace(tzinfo=UTC)
+        else:
+            normalized = value.astimezone(UTC)
+        return normalized.astimezone(DISPLAY_TIMEZONE)
+
     @staticmethod
     def _format_datetime(value: datetime | None) -> str | None:
         if value is None:
             return None
-        return value.strftime("%Y-%m-%d %H:%M")
+        local = EmployeeService._to_display_datetime(value)
+        return local.strftime("%Y-%m-%d %H:%M")
 
     @staticmethod
     def _format_history_datetime(value: datetime | None) -> str:
         if value is None:
             return ""
+        local = EmployeeService._to_display_datetime(value)
         return (
-            f"{value.year}年{value.month}月{value.day}日"
-            f"{value.hour}时{value.minute}分{value.second}秒"
+            f"{local.year}年{local.month}月{local.day}日"
+            f"{local.hour}时{local.minute}分"
         )
 
     @staticmethod