fix: discovery.peers resource competition problem

internal/discovery/model.go

@@ -61,3 +61,20 @@ func (p *PresencePacket) SignPayload() []byte {
 	// 格式: id|name|port|os|pk
 	return fmt.Appendf(nil, "%s|%s|%d|%s|%s", p.ID, p.Name, p.Port, p.OS, p.PublicKey)
 }
+
+// DeepCopy 返回 Peer 的深拷贝
+func (p Peer) DeepCopy() *Peer {
+	newPeer := p // 结构体浅拷贝 (值类型字段已复制)
+
+	// 手动深拷贝引用类型字段 (Routes)
+	if p.Routes != nil {
+		newPeer.Routes = make(map[string]*RouteState, len(p.Routes))
+		for k, v := range p.Routes {
+			// RouteState 只有值类型字段，但它是指针，所以需要新建对象并解引用赋值
+			stateCopy := *v
+			newPeer.Routes[k] = &stateCopy
+		}
+	}
+
+	return &newPeer
+}

internal/discovery/service.go

@@ -337,7 +337,7 @@ func (s *Service) GetPeerByIP(ip string) (*Peer, bool) {
 
 	for _, p := range s.peers {
 		if p.Routes[ip] != nil {
-			return p, true
+			return p.DeepCopy(), true
 		}
 	}
 	return nil, false
@@ -348,7 +348,10 @@ func (s *Service) GetPeerByID(id string) (*Peer, bool) {
 	defer s.peersMutex.RUnlock()
 
 	peer, ok := s.peers[id]
-	return peer, ok
+	if !ok {
+		return nil, false
+	}
+	return peer.DeepCopy(), true
 }
 
 func (s *Service) GetPeers() []Peer {
@@ -357,7 +360,7 @@ func (s *Service) GetPeers() []Peer {
 
 	list := make([]Peer, 0)
 	for _, p := range s.peers {
-		list = append(list, *p)
+		list = append(list, *p.DeepCopy())
 	}
 	sort.Slice(list, func(i, j int) bool {
 		return list[i].Name < list[j].Name