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/Web/WorkflowRunStore.cs

@@ -0,0 +1,35 @@
+using System.Collections.Concurrent;
+using MAF1.Decisions;
+using MAF1.Plugins;
+
+namespace MAF1.Web;
+
+internal sealed class WorkflowSession
+{
+    public required string RunId { get; init; }
+    public required WorkflowGraph Graph { get; init; }
+    public required NodeCatalogSnapshot Catalog { get; init; }
+    public required List<string> Order { get; init; }
+    public required Dictionary<string, Dictionary<string, object?>> Outputs { get; init; }
+    public required List<NodeRunLog> Steps { get; init; }
+    public int NextIndex { get; set; }
+    public DecisionRequest? Pending { get; set; }
+    public bool Completed { get; set; }
+    public WorkflowRunResult LastResult { get; set; } = new();
+    public DecisionAnswer? AppliedDecision { get; set; }
+    public CancellationTokenSource TimeoutCts { get; set; } = new();
+    public SemaphoreSlim Mutex { get; } = new(1, 1);
+    public object Sync { get; } = new();
+}
+
+public sealed class WorkflowRunStore
+{
+    private readonly ConcurrentDictionary<string, WorkflowSession> _sessions = new(StringComparer.OrdinalIgnoreCase);
+
+    internal bool TryAdd(WorkflowSession session) => _sessions.TryAdd(session.RunId, session);
+
+    internal bool TryGet(string runId, out WorkflowSession? session) => _sessions.TryGetValue(runId, out session);
+
+    public WorkflowRunResult? GetResult(string runId)
+        => _sessions.TryGetValue(runId, out WorkflowSession? session) ? session.LastResult : null;
+}