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/main.ts

@@ -0,0 +1,19 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import ElementPlus from 'element-plus'
+import 'element-plus/dist/index.css'
+import zhCn from 'element-plus/es/locale/lang/zh-cn'
+import './styles/theme.css'
+
+import App from './App.vue'
+import router from './router'
+import { useUiStore } from '@/stores/ui'
+
+const app = createApp(App)
+const pinia = createPinia()
+app.use(pinia)
+// 启动时恢复用户上次选择的主题色板（默认工业紫色）
+useUiStore(pinia).applyCurrentTheme()
+app.use(router)
+app.use(ElementPlus, { locale: zhCn })
+app.mount('#app')