Add protocol fallback to fetch quoted messages

When existing lookup methods fail to find a referenced/reply message, try a protocol-level fallback using PacketApi. If PacketApi.packetStatus is available, attempt FetchGroupMessage or FetchC2CMessage by sequence, match by contentHead.sequence, and use contentHead.newId as the message id to build reply data. Log warnings on success/not-found and errors on exceptions.

Author: MliKiowa

packages/napcat-onebot/api/msg.ts

@@ -384,6 +384,26 @@ export class OneBotMsgApi {
         this.core.context.logger.logError('所有查找方法均失败，获取不到旧客户端的引用消息', element.replayMsgSeq);
       }
 
+      // 协议兜底：尝试通过协议直接获取消息
+      if (this.core.apis.PacketApi.packetStatus) {
+        try {
+          const msgSeq = +element.replayMsgSeq;
+          const fetchedMsgs = msg.chatType === ChatType.KCHATTYPEGROUP
+            ? await this.core.apis.PacketApi.pkt.operation.FetchGroupMessage(+msg.peerUin, msgSeq, msgSeq)
+            : await this.core.apis.PacketApi.pkt.operation.FetchC2CMessage(msg.peerUid, msgSeq, msgSeq);
+
+          const targetMsg = fetchedMsgs.find(m => (m.contentHead.sequence ?? 0) === msgSeq);
+          if (targetMsg?.contentHead?.newId) {
+            const msgId = String(targetMsg.contentHead.newId);
+            this.core.context.logger.logWarn('通过协议兜底成功获取引用消息', msgId);
+            return createReplyData(msgId);
+          }
+          this.core.context.logger.logWarn('协议兜底未找到匹配的引用消息');
+        } catch (e) {
+          this.core.context.logger.logError('协议兜底获取引用消息失败', (e as Error).stack);
+        }
+      }
+
       return null;
     },
     videoElement: async (element, msg, elementWrapper, { disableGetUrl }) => {