submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Message/Entity/ReplySegment.cs

@@ -0,0 +1,50 @@
+using System.Text.Json.Serialization;
+using Lagrange.Core.Message;
+using Lagrange.Core.Message.Entity;
+using Lagrange.OneBot.Database;
+
+namespace Lagrange.OneBot.Message.Entity;
+
+[Serializable]
+public partial class ReplySegment(uint messageId)
+{
+    public ReplySegment() : this(0) { }
+
+    [JsonPropertyName("id")][CQProperty] public string MessageId { get; set; } = messageId.ToString();
+}
+
+[SegmentSubscriber(typeof(ForwardEntity), "reply")]
+public partial class ReplySegment : SegmentBase
+{
+    internal MessageChain? TargetChain { get; set; }
+
+    internal uint Sequence { get; private set; }
+
+    public override void Build(MessageBuilder builder, SegmentBase segment)
+    {
+        if (segment is ReplySegment reply && Database is not null)
+        {
+            var messageRecord = Database.GetCollection<MessageRecord>().FindById(int.Parse(reply.MessageId));
+            reply.TargetChain ??= (MessageChain)messageRecord;
+
+            var build = MessagePacker.Build(reply.TargetChain, "");
+            var virtualElem = build.Body?.RichText?.Elems;
+            if (virtualElem != null) reply.TargetChain.Elements.AddRange(virtualElem);
+
+            builder.Forward(reply.TargetChain);
+        }
+    }
+
+    public override SegmentBase FromEntity(MessageChain chain, IMessageEntity entity)
+    {
+        if (entity is not ForwardEntity forward || Database is null) throw new ArgumentException("The entity is not a forward entity.");
+
+        var collection = Database.GetCollection<MessageRecord>();
+
+        int hash = MessageRecord.CalcMessageHash(forward.MessageId, forward.Sequence);
+        var query = collection.FindById(hash);
+        return query == null
+            ? new ReplySegment { MessageId = 0.ToString() }
+            : new ReplySegment { MessageId = query.MessageHash.ToString() };
+    }
+}