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>

MiGu.Server/MiGu.Server.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <RootNamespace>MiGu.Server</RootNamespace>
+    <AssemblyName>MiGu.Server</AssemblyName>
+    <LangVersion>latest</LangVersion>
+    <InvariantGlobalization>false</InvariantGlobalization>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.10" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.7.3" />
+    <PackageReference Include="Yarp.ReverseProxy" Version="2.2.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.10" />
+    <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="data\.gitkeep" Condition="Exists('data\.gitkeep')" />
+  </ItemGroup>
+
+</Project>