feat(adminui): in-process browse session registry + TTL reaper + service

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Browsing/BrowseSessionRegistry.cs

@@ -0,0 +1,30 @@
+using System.Collections.Concurrent;
+using ZB.MOM.WW.OtOpcUa.Commons.Browsing;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Browsing;
+
+/// <summary>
+///     Singleton in-process directory of live <see cref="IBrowseSession"/> instances,
+///     keyed by <see cref="IBrowseSession.Token"/>. Concurrency is provided by the
+///     underlying <see cref="ConcurrentDictionary{TKey, TValue}"/> alone — there are no
+///     additional locks; callers must dispose evicted sessions outside the dictionary.
+/// </summary>
+public sealed class BrowseSessionRegistry
+{
+    private readonly ConcurrentDictionary<Guid, IBrowseSession> _sessions = new();
+
+    /// <summary>Adds (or replaces) a session in the registry keyed by its token.</summary>
+    public void Register(IBrowseSession session) => _sessions[session.Token] = session;
+
+    /// <summary>Looks up a session by token without removing it.</summary>
+    public bool TryGet(Guid token, out IBrowseSession session) =>
+        _sessions.TryGetValue(token, out session!);
+
+    /// <summary>Atomically removes a session from the registry, returning it for disposal.</summary>
+    public bool TryRemove(Guid token, out IBrowseSession session) =>
+        _sessions.TryRemove(token, out session!);
+
+    /// <summary>Returns a point-in-time snapshot of all currently registered sessions.</summary>
+    public IReadOnlyList<(Guid Token, IBrowseSession Session)> Snapshot() =>
+        _sessions.Select(kv => (kv.Key, kv.Value)).ToList();
+}