Add vue-router, login/setup flow and backend logging

Refactor frontend to route-based navigation with vue-router, add
system setup and login pages with API integration. Add structured
logging, access-log middleware and startup lifecycle to FastAPI
backend.

web/src/utils/requestViewModel.js

@@ -0,0 +1,87 @@
+function parseRequestDateFromId(id) {
+  const match = String(id || '').match(/^REQ-(\d{4})-(\d{2})(\d{2})$/)
+
+  if (!match) {
+    return ''
+  }
+
+  const [, year, month, day] = match
+  return `${year}-${month}-${day}`
+}
+
+function formatTripWindow(range) {
+  const normalized = String(range || '')
+
+  if (!normalized) {
+    return '待补充'
+  }
+
+  if (normalized.includes('本月')) {
+    return '本月申请'
+  }
+
+  if (normalized.includes('本周')) {
+    return '本周申请'
+  }
+
+  if (normalized.includes('今天')) {
+    return '今日申请'
+  }
+
+  return normalized
+}
+
+function mapApproval(status) {
+  if (status === 'success') {
+    return {
+      node: '已完成归档',
+      approval: '已完成',
+      approvalTone: 'success',
+      travel: '已完成行程',
+      travelTone: 'success'
+    }
+  }
+
+  if (status === 'danger') {
+    return {
+      node: '异常待复核',
+      approval: '待处理',
+      approvalTone: 'danger',
+      travel: '存在异常',
+      travelTone: 'danger'
+    }
+  }
+
+  return {
+    node: '财务审核中',
+    approval: '审批中',
+    approvalTone: 'info',
+    travel: '待安排行程',
+    travelTone: 'warning'
+  }
+}
+
+export function normalizeRequestForUi(request) {
+  if (!request) {
+    return null
+  }
+
+  const applyTime = parseRequestDateFromId(request.id) || '2026-04-18'
+  const reason = `${request.category || '差旅'}申请`
+  const city = request.entity || '待补充'
+  const period = formatTripWindow(request.range)
+  const approvalState = mapApproval(request.status)
+
+  return {
+    ...request,
+    reason,
+    city,
+    period,
+    applyTime,
+    node: approvalState.node,
+    approval: approvalState.approval,
+    approvalTone: approvalState.approvalTone,
+    travel: approvalState.travel,
+    travelTone: approvalState.travelTone
+  }
+}