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。

web/src/views/scripts/travelReimbursementConversationModel.js

@@ -4,6 +4,7 @@ import { buildAgentInsight, buildReviewFilePreviewsFromReviewPayload } from './t
 import { resolveExpenseTypeLabel } from './travelReimbursementReviewModel.js'
 import {
   GUIDED_ACTION_OPEN_TRAVEL_CALCULATOR,
+  GUIDED_ACTION_START_APPLICATION,
   GUIDED_ACTION_START_REIMBURSEMENT,
   GUIDED_ACTION_START_STATUS_QUERY
 } from './travelReimbursementGuidedFlowModel.js'
@@ -163,7 +164,7 @@ export const EXPENSE_WELCOME_QUICK_ACTIONS = [
 export const APPLICATION_WELCOME_QUICK_ACTIONS = [
   {
     label: '快速发起申请',
-    prompt: '我想快速发起一笔费用申请，请先帮我判断申请类型并引导补充信息。',
+    action: GUIDED_ACTION_START_APPLICATION,
     icon: 'mdi mdi-file-plus-outline'
   },
   {
@@ -252,6 +253,7 @@ export function createMessage(role, text, attachments = [], extras = {}) {
     reviewPanelScope: '',
     riskFlags: [],
     pendingAttachmentAssociation: null,
+    applicationPreview: null,
     ...extras
   }
 }
@@ -801,6 +803,7 @@ export function serializeSessionMessages(messages) {
     reviewPayload: message.reviewPayload || null,
     riskFlags: Array.isArray(message.riskFlags) ? message.riskFlags : [],
     pendingAttachmentAssociation: message.pendingAttachmentAssociation || null,
+    applicationPreview: message.applicationPreview || null,
     assistantName: message.assistantName || '',
     isWelcome: Boolean(message.isWelcome),
     welcomeQuickActions: Array.isArray(message.welcomeQuickActions) ? message.welcomeQuickActions : []