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

file_transfer_config.go

@@ -0,0 +1,81 @@
+package notify
+
+import "time"
+
+const defaultFileSendRetry = 3
+
+const defaultFileAckTimeout = 5 * time.Second
+
+type fileTransferConfig struct {
+	ChunkSize             int
+	AckTimeout            time.Duration
+	SendRetry             int
+	ReceiveCompletedLimit int
+	MonitorCompletedLimit int
+}
+
+func defaultFileTransferConfig() fileTransferConfig {
+	return fileTransferConfig{
+		ChunkSize:             defaultFileChunkSize,
+		AckTimeout:            defaultFileAckTimeout,
+		SendRetry:             defaultFileSendRetry,
+		ReceiveCompletedLimit: defaultFileReceiveCompletedLimit,
+		MonitorCompletedLimit: defaultFileTransferCompletedLimit,
+	}
+}
+
+func normalizeFileTransferConfig(cfg fileTransferConfig) fileTransferConfig {
+	defaults := defaultFileTransferConfig()
+	if cfg.ChunkSize <= 0 {
+		cfg.ChunkSize = defaults.ChunkSize
+	}
+	if cfg.AckTimeout <= 0 {
+		cfg.AckTimeout = defaults.AckTimeout
+	}
+	if cfg.SendRetry <= 0 {
+		cfg.SendRetry = defaults.SendRetry
+	}
+	if cfg.ReceiveCompletedLimit <= 0 {
+		cfg.ReceiveCompletedLimit = defaults.ReceiveCompletedLimit
+	}
+	if cfg.MonitorCompletedLimit <= 0 {
+		cfg.MonitorCompletedLimit = defaults.MonitorCompletedLimit
+	}
+	return cfg
+}
+
+func (c *ClientCommon) getFileTransferConfig() fileTransferConfig {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.fileTransferCfg = normalizeFileTransferConfig(c.fileTransferCfg)
+	return c.fileTransferCfg
+}
+
+func (s *ServerCommon) getFileTransferConfig() fileTransferConfig {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.fileTransferCfg = normalizeFileTransferConfig(s.fileTransferCfg)
+	return s.fileTransferCfg
+}
+
+func (c *ClientCommon) setFileTransferConfig(cfg fileTransferConfig) {
+	cfg = normalizeFileTransferConfig(cfg)
+	c.mu.Lock()
+	c.fileTransferCfg = cfg
+	state := c.logicalSession
+	c.mu.Unlock()
+	if state != nil {
+		state.applyFileTransferConfig(cfg)
+	}
+}
+
+func (s *ServerCommon) setFileTransferConfig(cfg fileTransferConfig) {
+	cfg = normalizeFileTransferConfig(cfg)
+	s.mu.Lock()
+	s.fileTransferCfg = cfg
+	state := s.logicalSession
+	s.mu.Unlock()
+	if state != nil {
+		state.applyFileTransferConfig(cfg)
+	}
+}