Add Surge MITM and scripts

mitm/constants.go

@@ -0,0 +1,11 @@
+package mitm
+
+import (
+	"encoding/base64"
+
+	"github.com/sagernet/sing/common"
+)
+
+var surgeTinyGif = common.OnceValue(func() []byte {
+	return common.Must1(base64.StdEncoding.DecodeString("R0lGODlhAQABAAAAACH5BAEAAAAALAAAAAABAAEAAAIBAAA="))
+})