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/composables/useLoginView.js

@@ -8,9 +8,24 @@ export function useLoginView() {
   const showPassword = ref(false)
 
   const features = [
-    { title: '智能审单', desc: 'AI 自动识别票据与规则，提升准确率与效率', icon: 'mdi mdi-file-document-outline', tone: 'green' },
-    { title: '异常预警', desc: '多维风险识别与预警，主动防控风险', icon: 'mdi mdi-bell-outline', tone: 'red' },
-    { title: 'SLA 监控', desc: '实时监控服务水平协议，保障审批及时性', icon: 'mdi mdi-sync', tone: 'blue' }
+    {
+      title: '智能审单',
+      desc: 'AI 自动识别票据与规则，提升准确率与处理效率',
+      icon: 'mdi mdi-file-document-outline',
+      tone: 'green'
+    },
+    {
+      title: '异常预警',
+      desc: '多维风险识别与预警，主动防控报销风险',
+      icon: 'mdi mdi-bell-outline',
+      tone: 'red'
+    },
+    {
+      title: 'SLA 监控',
+      desc: '实时监控服务水位，保障审批和处理时效',
+      icon: 'mdi mdi-sync',
+      tone: 'blue'
+    }
   ]
 
   const LogoMark = {