fix: method in vmess http-opts is not used

common/util/manipulation.go

@@ -0,0 +1,8 @@
+package util
+
+import "github.com/samber/lo"
+
+func EmptyOr[T comparable](v T, def T) T {
+	ret, _ := lo.Coalesce(v, def)
+	return ret
+}