调整 .gitignore 以适配 backends 目录结构

将 MiGu.Server 相关忽略规则迁移至 backends/MiGu.Server，并新增对 .tmp-build* 和 /.cursor/rules 的忽略，优化敏感数据与临时文件的管理。

MiGu.Server/Configs/ScenarioTemplateConfig.cs

@@ -1,25 +0,0 @@
-namespace MiGu.Server.Configs;
-
-public record ScenarioTemplate(string Id, string Name, string Category, string Version, string BaselineJson);
-public record TemplateDslPolicy(bool Enabled, string SchemaVersion);
-public record LowCodePolicy(bool Enabled, string Editor);
-public record TemplateVersionPolicy(int KeepVersions, bool AllowRollback);
-
-public record ScenarioTemplateConfig(
-    List<ScenarioTemplate> Templates,
-    TemplateDslPolicy DslPolicy,
-    LowCodePolicy LowCode,
-    TemplateVersionPolicy VersionPolicy)
-{
-    public static ScenarioTemplateConfig Default() => new(
-        Templates: new List<ScenarioTemplate>
-        {
-            new("tpl-sps", "SPS 物料配送", "SPS", "1.0.0", "{}"),
-            new("tpl-pack", "电池 Pack 自动化产线", "BatteryPack", "1.0.0", "{}"),
-            new("tpl-loop", "环线运行", "Loop", "1.0.0", "{}"),
-            new("tpl-p2p", "点对点柔性搬运", "P2P", "1.0.0", "{}")
-        },
-        DslPolicy: new TemplateDslPolicy(true, "1"),
-        LowCode: new LowCodePolicy(false, "json"),
-        VersionPolicy: new TemplateVersionPolicy(10, true));
-}