Update App version to 0.1.2

Signed-off-by: luckfox-eng29 <eng29@luckfox.com>

network_mac.go

@@ -0,0 +1,20 @@
+package kvm
+
+import (
+	"fmt"
+	"os"
+)
+
+const ethernetMacAddressPath = "/userdata/ethaddr.txt"
+
+func rpcSetEthernetMacAddress(macAddress string) (interface{}, error) {
+	normalized, err := networkState.SetMACAddress(macAddress)
+	if err != nil {
+		return nil, err
+	}
+	if err := os.WriteFile(ethernetMacAddressPath, []byte(normalized+"\n"), 0644); err != nil {
+		return nil, fmt.Errorf("failed to write %s: %w", ethernetMacAddressPath, err)
+	}
+	return networkState.RpcGetNetworkState(), nil
+}
+