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/router/index.js

@@ -0,0 +1,110 @@
+import { createRouter, createWebHistory } from 'vue-router'
+
+import { appViews } from '../composables/useNavigation.js'
+import { useSystemState } from '../composables/useSystemState.js'
+import AppShellRouteView from '../views/AppShellRouteView.vue'
+import LoginRouteView from '../views/LoginRouteView.vue'
+import SetupRouteView from '../views/SetupRouteView.vue'
+
+const appChildRoutes = appViews
+  .filter((view) => view !== 'requests')
+  .map((view) => ({
+    path: view,
+    name: `app-${view}`,
+    component: AppShellRouteView,
+    meta: {
+      requiresAuth: true,
+      appView: view
+    }
+  }))
+
+const router = createRouter({
+  history: createWebHistory(),
+  routes: [
+    {
+      path: '/',
+      name: 'root',
+      redirect: () => {
+        const { resolveEntryRoute } = useSystemState()
+        return resolveEntryRoute()
+      }
+    },
+    {
+      path: '/setup',
+      name: 'setup',
+      component: SetupRouteView
+    },
+    {
+      path: '/login',
+      name: 'login',
+      component: LoginRouteView
+    },
+    {
+      path: '/app',
+      redirect: { name: 'app-overview' }
+    },
+    {
+      path: '/app/requests',
+      name: 'app-requests',
+      component: AppShellRouteView,
+      meta: {
+        requiresAuth: true,
+        appView: 'requests'
+      }
+    },
+    {
+      path: '/app/requests/:requestId',
+      name: 'app-request-detail',
+      component: AppShellRouteView,
+      meta: {
+        requiresAuth: true,
+        appView: 'requests'
+      }
+    },
+    ...appChildRoutes.map((route) => ({
+      ...route,
+      path: `/app/${route.path}`
+    })),
+    {
+      path: '/:pathMatch(.*)*',
+      redirect: '/'
+    }
+  ]
+})
+
+router.beforeEach((to) => {
+  const { isInitialized, loggedIn, resolveEntryRoute } = useSystemState()
+
+  if (!isInitialized.value) {
+    if (to.name !== 'setup') {
+      return { name: 'setup' }
+    }
+
+    return true
+  }
+
+  if (to.name === 'setup') {
+    return resolveEntryRoute()
+  }
+
+  if (!loggedIn.value && to.meta.requiresAuth) {
+    return {
+      name: 'login',
+      query: {
+        redirect: to.fullPath
+      }
+    }
+  }
+
+  if (loggedIn.value && to.name === 'login') {
+    return resolveEntryRoute()
+  }
+
+  if (to.name === 'root') {
+    return resolveEntryRoute()
+  }
+
+  return true
+})
+
+export default router