优化: 大文件拆分+代码分割+按需加载+console清理+any类型替换

- Money.tsx (2260行→54行): 拆分为 money/ 子目录4个组件, React.lazy二级分割
- AIAssistant.tsx (2038行→63行): 拆分为 ai-assistant/ 子目录6个组件, React.lazy二级分割
- xlsx改为动态导入, OvertimeTab从345KB降至12.7KB
- api-services.ts: 请求参数 any→Record<string,unknown>
- 移除前端3处console.log残留
- 后端console替换为pino logger
- 前后端未使用import/变量清理
- Zod schema验证: termination/platform/special-status/work-process
- 新增 leave.routes.ts, acceptance-test.routes.ts
- UI组件: PageGuide, QueryError, Stepper

backend/src/services/risk.service.ts

@@ -666,7 +666,7 @@ export async function getDashboardData(orgId: string) {
   const yearEnd = new Date(now.getFullYear(), 11, 31, 23, 59, 59)
 
   const [
-    employeeCount, highRisks, pendingRisks, riskItems, resolvedItems,
+    employeeCount, _highRisks, _pendingRisks, riskItems, resolvedItems,
     overtimeRecords, payslips, batchEntries, socialConfig, housingConfig,
     monthContracts, monthTerminations, monthDisciplinary, monthAttendance,
     monthSeverancePay,
@@ -1217,17 +1217,13 @@ export async function getCostAnalysis(orgId: string, month: string) {
   const monthNum = parseInt(month.slice(5, 7))
 
   // 当月数据
-  const currentMonthStart = new Date(year, monthNum - 1, 1)
-  const currentMonthEnd = new Date(year, monthNum, 0, 23, 59, 59)
 
   // 上月（环比）
   const prevMonthStart = new Date(year, monthNum - 2, 1)
-  const prevMonthEnd = new Date(year, monthNum - 1, 0, 23, 59, 59)
   const prevMonthStr = `${prevMonthStart.getFullYear()}-${String(prevMonthStart.getMonth() + 1).padStart(2, '0')}`
 
   // 去年同月（同比）
   const lastYearMonthStart = new Date(year - 1, monthNum - 1, 1)
-  const lastYearMonthEnd = new Date(year - 1, monthNum, 0, 23, 59, 59)
   const lastYearMonthStr = `${lastYearMonthStart.getFullYear()}-${String(lastYearMonthStart.getMonth() + 1).padStart(2, '0')}`
 
   // 获取各月归档批次汇总（按员工去重，与 getDashboardData 口径一致）
@@ -1802,7 +1798,7 @@ export async function getAnnualValueReport(orgId: string, year: number) {
 
   const [
     risksResolved,
-    lossAvoidedAgg,
+    _lossAvoidedAgg,
     aiConversations,
     aiReviews,
     contractsSigned,
@@ -2043,11 +2039,6 @@ export async function getAnnualValueReport(orgId: string, year: number) {
   // 总价值 = 规避损失 + 节约成本
   const totalValue = adjustedLossAvoided + costSaved
 
-  // ROI = 总价值 / 系统成本（年费 12000 元），上限 9999%
-  const systemCost = 12000
-  const rawRoi = systemCost > 0 ? Math.round((totalValue / systemCost) * 100) : 0
-  const roi = Math.min(rawRoi, 9999)
-
   const metrics = {
     risksResolved,
     lossAvoided,