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/views/LoginRouteView.vue

@@ -0,0 +1,46 @@
+<template>
+  <LoginView
+    :company-name="companyProfile.name"
+    :submitting="loginSubmitting"
+    :error-message="loginError"
+    @login="submitLogin"
+    @recover-password="handleRecoverPassword"
+    @sso-login="handleSsoLogin"
+  />
+</template>
+
+<script setup>
+import { useRoute, useRouter } from 'vue-router'
+
+import { useSystemState } from '../composables/useSystemState.js'
+import LoginView from './LoginView.vue'
+
+const route = useRoute()
+const router = useRouter()
+const {
+  companyProfile,
+  handleLogin,
+  handleRecoverPassword,
+  handleSsoLogin,
+  loginError,
+  loginSubmitting,
+  resolveEntryRoute
+} = useSystemState()
+
+async function submitLogin(credentials) {
+  const passed = await handleLogin(credentials)
+
+  if (!passed) {
+    return
+  }
+
+  const redirect = typeof route.query.redirect === 'string' ? route.query.redirect : ''
+
+  if (redirect.startsWith('/app/')) {
+    router.replace(redirect)
+    return
+  }
+
+  router.replace(resolveEntryRoute())
+}
+</script>