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/Configs/OpsConfig.cs

@@ -0,0 +1,28 @@
+namespace MiGu.Server.Configs;
+
+public record PlaybackPolicy(int RetentionDays, int SamplingHz);
+public record LogRetention(int HotDays, int ColdDays);
+public record VersionPolicy(int KeepReleases);
+public record MonitorPanelPolicy(string[] PropertyKeys, string[] StatusKeys, string[] ActionKeys);
+public record MonitorOpsPolicy(
+    MonitorPanelPolicy Car,
+    MonitorPanelPolicy Site,
+    MonitorPanelPolicy Track,
+    Dictionary<string, string[]> CarActionByType);
+
+public record OpsConfig(
+    PlaybackPolicy Playback,
+    LogRetention LogRetention,
+    VersionPolicy Version,
+    MonitorOpsPolicy Monitor)
+{
+    public static OpsConfig Default() => new(
+        Playback: new PlaybackPolicy(30, 5),
+        LogRetention: new LogRetention(7, 180),
+        Version: new VersionPolicy(5),
+        Monitor: new MonitorOpsPolicy(
+            Car: new MonitorPanelPolicy(Array.Empty<string>(), Array.Empty<string>(), Array.Empty<string>()),
+            Site: new MonitorPanelPolicy(Array.Empty<string>(), Array.Empty<string>(), Array.Empty<string>()),
+            Track: new MonitorPanelPolicy(Array.Empty<string>(), Array.Empty<string>(), Array.Empty<string>()),
+            CarActionByType: new Dictionary<string, string[]>()));
+}