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_session_runtime.go

@@ -50,6 +50,10 @@ func prepareClientSessionRuntime(rt *clientSessionRuntime) *clientSessionRuntime
 }
 
 func (c *ClientCommon) setClientSessionRuntime(rt *clientSessionRuntime) {
+	c.setClientSessionRuntimeWithCloseOld(rt, false)
+}
+
+func (c *ClientCommon) setClientSessionRuntimeWithCloseOld(rt *clientSessionRuntime, closeOld bool) {
 	if c == nil || rt == nil {
 		return
 	}
@@ -69,7 +73,7 @@ func (c *ClientCommon) setClientSessionRuntime(rt *clientSessionRuntime) {
 		c.conn = rt.conn
 	}
 	if oldBinding != nil {
-		oldBinding.stopBackgroundWorkers()
+		stopReplacedTransportBinding(oldBinding, rt.transport, closeOld)
 	}
 }
 
@@ -155,7 +159,7 @@ func (c *ClientCommon) clearClientSessionRuntimeTransport() {
 	next.conn = nil
 	next.transportStopCtx = nil
 	next.transportStopFn = nil
-	c.setClientSessionRuntime(&next)
+	c.setClientSessionRuntimeWithCloseOld(&next, true)
 }
 
 func (c *ClientCommon) clearClientSessionRuntimeQueue() {
@@ -199,7 +203,7 @@ func (c *ClientCommon) attachClientSessionTransport(conn net.Conn) error {
 	next.transportStopCtx = nil
 	next.transportStopFn = nil
 	next.suppressGoodByeOnStop = &atomic.Bool{}
-	c.setClientSessionRuntime(&next)
+	c.setClientSessionRuntimeWithCloseOld(&next, true)
 	if oldConn := oldBinding.connSnapshot(); oldConn != nil && oldConn != conn {
 		_ = oldConn.Close()
 	}