feat: 增强风险规则生成引擎与预算中心页面

后端拆分风险规则生成为解释器、语义分析、本体对齐等子模块，
优化模板执行和流程图生成，完善员工种子数据和导入逻辑，增强
报销单权限策略和草稿持久化，前端新增预算中心视图和趋势图
组件，重构审计页面和风险规则测试对话框交互，完善文档中心
和报销创建页面细节，补充单元测试覆盖。

server/tests/test_employee_service.py

@@ -15,6 +15,8 @@ from app.models.organization import OrganizationUnit
 from app.models.role import Role
 from app.schemas.employee import EmployeeUpdate
 from app.services.employee import EmployeeService
+from app.services.employee_seed import CANONICAL_DEPARTMENT_CODES
+from app.services.employee_time import format_history_datetime
 
 
 def build_session() -> Session:
@@ -49,7 +51,7 @@ def test_employee_directory_seeds_rich_employee_data() -> None:
         history_count = db.scalar(select(func.count()).select_from(EmployeeChangeLog))
 
         assert role_count == 6
-        assert org_count == 10
+        assert org_count == 7
         assert employee_count == 30
         assert history_count and history_count >= 30
 
@@ -194,6 +196,42 @@ def test_employee_meta_includes_organization_options() -> None:
 
         assert meta.organizationOptions
         assert all(item.code and item.name for item in meta.organizationOptions)
+        assert [item.name for item in meta.organizationOptions] == [
+            "人力资源部",
+            "市场部",
+            "总裁办",
+            "技术部",
+            "生产部",
+            "财务部",
+        ]
+
+
+def test_employee_directory_normalizes_legacy_departments() -> None:
+    with build_session() as db:
+        service = EmployeeService(db)
+        service.list_employees()
+
+        legacy_department = OrganizationUnit(
+            unit_code="RND-CENTER",
+            name="产品研发中心",
+            unit_type="department",
+        )
+        employee = db.execute(
+            select(Employee).where(Employee.employee_no == "E11745")
+        ).scalar_one()
+        employee.organization_unit = legacy_department
+        db.add(legacy_department)
+        db.commit()
+
+        refreshed = next(
+            item for item in service.list_employees() if item.employeeNo == "E11745"
+        )
+        meta = service.get_employee_meta()
+
+        assert refreshed.department == "技术部"
+        assert refreshed.organization is not None
+        assert refreshed.organization.code == "TECH-DEPT"
+        assert "RND-CENTER" not in {item.code for item in meta.organizationOptions}
 
 
 def test_update_employee_changes_organization() -> None:
@@ -202,7 +240,11 @@ def test_update_employee_changes_organization() -> None:
         employee = service.list_employees()[0]
         organizations = service.repository.list_organization_units()
         current_code = employee.organization.code if employee.organization else None
-        target = next(unit for unit in organizations if unit.unit_code != current_code)
+        target = next(
+            unit
+            for unit in organizations
+            if unit.unit_code in CANONICAL_DEPARTMENT_CODES and unit.unit_code != current_code
+        )
 
         updated = service.update_employee(
             employee.id,
@@ -245,7 +287,7 @@ def test_update_employee_changes_manager() -> None:
 
 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)
+    formatted = format_history_datetime(value)
 
     assert formatted == "2026年5月20日14时30分"
     assert "秒" not in formatted