feat: 迁入 MiGu.Server、平台前端与车辆列表 reflection 回退

从 Simple-FR 拆出 Platform.Server 并重命名为 MiGu.Server；frontends 源码与构建脚本迁入本仓库。地图监控在 projection/cars 失败或为空时回退 reflection 车辆列表；Simple 仓库已移除旧 Platform.Server。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontends/apps/simple-platform-vue/src/App.vue

@@ -0,0 +1,22 @@
+<template>
+  <router-view v-slot="{ Component }">
+    <component :is="Component" />
+  </router-view>
+</template>
+
+<script setup lang="ts">
+</script>
+
+<style>
+html, body, #app {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+#app {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
+  color: #303133;
+  background: #f0f2f5;
+}
+</style>