完成前后端框架搭建，完成聊天页面布局

web/src/App.vue

@@ -0,0 +1,28 @@
+<template>
+  <router-view></router-view>
+</template>
+
+<script>
+import { defineComponent } from 'vue'
+
+export default defineComponent({
+  setup () {
+    // TODO: 获取会话
+  },
+})
+</script>
+
+
+<style lang="stylus">
+html, body {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+#app {
+  margin: 0 !important;
+  padding: 0 !important;
+  font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
+}
+</style>