BREAKING CHANGE: move Uncloud API socket to /run/uncloud/api/uncloud.sock, activate it by systemd socket unit

internal/machine/constants/constants.go

@@ -1,8 +1,9 @@
 package constants
 
 const (
-	// MachineAPIPort is the port for the Machine API service on the management WireGuard network.
-	MachineAPIPort = 51000
-	// UnregistryPort is the port for the embedded container registry listening on the machine IP.
+	// UncloudAPIPort is the TCP port on which each machine serves the Uncloud API over the management WireGuard
+	// network.
+	UncloudAPIPort = 51000
+	// UnregistryPort is the TCP port for the embedded container registry listening on the machine IP.
 	UnregistryPort = 51500
 )