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/ChargePolicy.cs

@@ -0,0 +1,18 @@
+namespace MiGu.Server.Configs;
+
+public record ChargePriorityRule(string Id, string Condition, double Weight);
+
+public record ChargePolicy(
+    bool AllowMidTaskCharge,
+    int IdleChargeAfterSec,
+    List<ChargePriorityRule> Priority)
+{
+    public static ChargePolicy Default() => new(
+        AllowMidTaskCharge: false,
+        IdleChargeAfterSec: 300,
+        Priority: new List<ChargePriorityRule>
+        {
+            new("CP1", "soc<0.2", 100),
+            new("CP2", "idle>5min", 30)
+        });
+}