feat(notify): 重构通信内核并补齐 stream/bulk/record/transfer 能力

- 引入 LogicalConn/TransportConn 分层，ClientConn 保留兼容适配层
  - 新增 Stream、Bulk、RecordStream 三条数据面能力及对应控制路径
  - 完成 transfer/file 传输内核与状态快照、诊断能力
  - 补齐 reconnect、inbound dispatcher、modern psk 等基础模块
  - 增加大规模回归、并发与基准测试覆盖
  - 更新依赖库

server_monitor.go

@@ -0,0 +1,97 @@
+package notify
+
+import "time"
+
+type expiredDetachedClientCandidate struct {
+	logical    *LogicalConn
+	detachedAt time.Time
+}
+
+func (s *ServerCommon) shutdownMonitorPool() {
+	s.getPendingWaitPool().closeAll()
+	s.getFileAckPool().closeAll()
+	s.getSignalAckPool().closeAll()
+}
+
+func (s *ServerCommon) monitorPoolTick(now time.Time) {
+	s.getPendingWaitPool().cleanupExpired(s.noFinSyncMsgMaxKeepSeconds, now)
+	s.cleanupExpiredDetachedClients(now)
+	s.cleanupLostHeartbeatClients(now)
+}
+
+func (s *ServerCommon) cleanupLostHeartbeatClients(now time.Time) {
+	if s.maxHeartbeatLostSeconds == 0 {
+		return
+	}
+	for _, logical := range s.snapshotLostHeartbeatClients(now.Unix()) {
+		if logical.shouldPreserveLogicalPeerOnTransportLoss() {
+			s.detachLogicalSessionTransport(logical, "heartbeat timeout", nil)
+			continue
+		}
+		s.stopLogicalSession(logical, "heartbeat timeout", nil)
+	}
+}
+
+func (s *ServerCommon) snapshotLostHeartbeatClients(nowUnix int64) []*LogicalConn {
+	allLogicals := s.GetLogicalConnList()
+	logicals := make([]*LogicalConn, 0, len(allLogicals))
+	for _, logical := range allLogicals {
+		if logical == nil {
+			continue
+		}
+		if logical.shouldPreserveLogicalPeerOnTransportLoss() && !logical.transportAttachedSnapshot() {
+			continue
+		}
+		if nowUnix-logical.lastHeartbeatUnixSnapshot() > s.maxHeartbeatLostSeconds {
+			logicals = append(logicals, logical)
+		}
+	}
+	return logicals
+}
+
+func (s *ServerCommon) cleanupExpiredDetachedClients(now time.Time) {
+	keepSec := s.DetachedClientKeepSec()
+	if keepSec <= 0 {
+		return
+	}
+	keep := time.Duration(keepSec) * time.Second
+	for _, candidate := range s.snapshotExpiredDetachedClients(now, keep) {
+		logical := candidate.logical
+		if logical == nil || !logical.logicalTransportDetachedSnapshot() {
+			continue
+		}
+		detach := logical.transportDetachSnapshot()
+		if detach == nil || !detach.At.Equal(candidate.detachedAt) {
+			continue
+		}
+		if now.Sub(detach.At) < keep {
+			continue
+		}
+		s.stopLogicalSession(logical, "detached transport expired", nil)
+	}
+}
+
+func (s *ServerCommon) snapshotExpiredDetachedClients(now time.Time, keep time.Duration) []expiredDetachedClientCandidate {
+	if keep <= 0 {
+		return nil
+	}
+	allLogicals := s.GetLogicalConnList()
+	clients := make([]expiredDetachedClientCandidate, 0, len(allLogicals))
+	for _, logical := range allLogicals {
+		if logical == nil || !logical.logicalTransportDetachedSnapshot() {
+			continue
+		}
+		detach := logical.transportDetachSnapshot()
+		if detach == nil || detach.At.IsZero() {
+			continue
+		}
+		if now.Sub(detach.At) < keep {
+			continue
+		}
+		clients = append(clients, expiredDetachedClientCandidate{
+			logical:    logical,
+			detachedAt: detach.At,
+		})
+	}
+	return clients
+}