feat: 拆分 CLI 与网页宿主，并在无有效城市时暂停等人确认

将原单体 MAF1 拆成 MAF1（控制台工作流）和 MAF1.Web（可视化编排）。
抽城市失败时暂停：网页弹确认、CLI 控制台询问，超时采用默认结束查询；
也可改填城市后继续。共享决策模型放在 MAF1.Core。

MAF1.Web/PluginHost/PluginOptions.cs

@@ -0,0 +1,36 @@
+using Microsoft.Extensions.Configuration;
+
+namespace MAF1.Plugins;
+
+public sealed class PluginOptions
+{
+    public string Directory { get; set; } = "plugins";
+    public int DefaultTimeoutSeconds { get; set; } = 180;
+
+    public string ResolveRoot()
+    {
+        if (Path.IsPathRooted(Directory))
+        {
+            return Directory;
+        }
+
+        return Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, Directory));
+    }
+
+    public static PluginOptions Load(IConfiguration config)
+        => config.GetSection("Plugins").Get<PluginOptions>() ?? new PluginOptions();
+}
+
+public sealed class LoadedPlugin
+{
+    public required string FolderName { get; init; }
+    public required string FolderPath { get; init; }
+    public required PluginContract.PluginManifest Manifest { get; init; }
+}
+
+public sealed class CatalogIssue
+{
+    public string Level { get; init; } = "error";
+    public string Source { get; init; } = "";
+    public string Message { get; init; } = "";
+}