feat: added record qso dvk

internal/cat/cat.go

@@ -27,6 +27,9 @@ type Backend interface {
 	// Implementations decide USB vs LSB (typically by current freq) and
 	// generic vs specific digital modes (most rigs just have DATA).
 	SetMode(mode string) error
+	// SetPTT keys (on=true) or unkeys the transmitter. Used by the Digital
+	// Voice Keyer to put the rig into TX while a message plays.
+	SetPTT(on bool) error
 }
 
 // RigState is the snapshot exchanged with the frontend.
@@ -161,6 +164,11 @@ func (m *Manager) SetMode(mode string) error {
 	return m.exec(func(b Backend) error { return b.SetMode(mode) })
 }
 
+// SetPTT dispatches a transmit on/off request to the CAT goroutine.
+func (m *Manager) SetPTT(on bool) error {
+	return m.exec(func(b Backend) error { return b.SetPTT(on) })
+}
+
 // exec marshals a backend operation onto the CAT goroutine. Returns the
 // operation's error or a "busy"/"not running" error if dispatch failed.
 func (m *Manager) exec(fn func(Backend) error) error {