feat: 重构报销单AI预审流程并添加平台风险规则引擎

- 将AI验审改为AI预审，高风险不再拦截而是随单流转给审批人复核
- 新增平台风险规则评估引擎，支持事由过短、票据异常、重复发票等多种评估器
- 用户上下文增加部门信息(department_name)，认证流程同步关联组织架构
- 规则scenario_json改为中文标签(差旅/费用科目)，统一场景分类
- 新增orchestrator审核流程测试用例
- 前端更新审计视图、差旅报销等相关页面

web/src/services/api.js

@@ -47,8 +47,10 @@ function readCurrentUserHeaders() {
     const name = String(payload?.name || username).trim()
     const roleCodes = Array.isArray(payload?.roleCodes) ? payload.roleCodes.filter(Boolean) : []
     const isAdmin = Boolean(payload?.isAdmin)
+    const department = String(payload?.department || payload?.departmentName || '').trim()
     const safeUsername = pickSafeHeaderValue(username)
     const safeName = pickSafeHeaderValue(name)
+    const safeDepartment = pickSafeHeaderValue(department)
 
     if (!safeUsername && !safeName) {
       return {}
@@ -67,6 +69,10 @@ function readCurrentUserHeaders() {
       headers['x-auth-name'] = safeName
     }
 
+    if (safeDepartment) {
+      headers['x-auth-department'] = safeDepartment
+    }
+
     return headers
   } catch {
     return {}