fix(notify): 根治低带宽控制面阻塞与传输写入卡死

- 为控制消息增加优先级、公平调度、队列字节预算和自适应批处理
- 支持可取消的写门等待，收紧 shared/dedicated bulk、stream 和 Reply 写入边界
- 修复 bulk reset/close、连接 handoff 和安全 profile 切换时序
- 保留旧取消与超时错误契约，新增阶段化 TransportSendError
- 增加 ReplyCtx、ReplyObjCtx、写超时配置及黑洞连接和竞态回归测试

client_transport.go

@@ -239,6 +239,14 @@ func (c *ClientCommon) writeToTransport(data []byte) error {
 }
 
 func (c *ClientCommon) writePayloadToTransport(payload []byte) error {
+	return c.writePayloadToTransportContext(context.Background(), payload)
+}
+
+func (c *ClientCommon) writePayloadToTransportContext(ctx context.Context, payload []byte) error {
+	return c.writePayloadToTransportContextTimeout(ctx, payload, 0)
+}
+
+func (c *ClientCommon) writePayloadToTransportContextTimeout(ctx context.Context, payload []byte, writeTimeout time.Duration) error {
 	binding := c.clientTransportBindingSnapshot()
 	if binding == nil {
 		return net.ErrClosed
@@ -247,15 +255,23 @@ func (c *ClientCommon) writePayloadToTransport(payload []byte) error {
 	if queue == nil {
 		return errClientSessionQueueUnavailable
 	}
-	return binding.withConnWriteLock(func(conn net.Conn) error {
-		if c.maxWriteTimeout.Seconds() != 0 {
-			_ = conn.SetWriteDeadline(time.Now().Add(c.maxWriteTimeout))
-		}
+	writeTimeout = shorterPositiveDuration(c.maxWriteTimeoutSnapshot(), writeTimeout)
+	lockAcquired, err := binding.withConnWriteLockContextStopTimeout(ctx, nil, writeTimeout, func(conn net.Conn) error {
 		return writeFramedPayloadUnlocked(conn, queue, payload)
 	})
+	if lockAcquired && err != nil {
+		if conn := binding.connSnapshot(); conn != nil && !isPacketTransportConn(conn) {
+			binding.closeConn()
+		}
+	}
+	return err
 }
 
-func (c *ClientCommon) writeControlPayloadToTransport(payload []byte) error {
+func (c *ClientCommon) writeControlPayloadToTransport(ctx context.Context, payload []byte, priority controlPriority) error {
+	return c.writeControlPayloadToTransportTimeout(ctx, payload, priority, 0)
+}
+
+func (c *ClientCommon) writeControlPayloadToTransportTimeout(ctx context.Context, payload []byte, priority controlPriority, writeTimeout time.Duration) error {
 	binding := c.clientTransportBindingSnapshot()
 	if binding == nil {
 		return net.ErrClosed
@@ -266,11 +282,11 @@ func (c *ClientCommon) writeControlPayloadToTransport(payload []byte) error {
 	}
 	conn := binding.connSnapshot()
 	if conn == nil || isPacketTransportConn(conn) {
-		return c.writePayloadToTransport(payload)
+		return c.writePayloadToTransportContextTimeout(ctx, payload, writeTimeout)
 	}
 	sender := binding.controlBatchSenderSnapshot()
 	if sender == nil {
-		return c.writePayloadToTransport(payload)
+		return c.writePayloadToTransportContextTimeout(ctx, payload, writeTimeout)
 	}
-	return sender.submit(payload, writeDeadlineFromTimeout(c.maxWriteTimeout))
+	return sender.submitContext(ctx, payload, shorterPositiveDuration(c.maxWriteTimeoutSnapshot(), writeTimeout), priority)
 }