feat: add Loopback simplified config

proxy/loopback/config.pb.go

@@ -7,6 +7,7 @@
 package loopback
 
 import (
+	_ "github.com/v2fly/v2ray-core/v4/common/protoext"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -73,10 +74,14 @@ var file_proxy_loopback_config_proto_rawDesc = []byte{
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proxy/loopback/config.proto

@@ -6,6 +6,11 @@ option go_package = "github.com/v2fly/v2ray-core/v4/proxy/loopback";
 option java_package = "com.v2ray.core.proxy.loopback";
 option java_multiple_files = true;
 
+import "common/protoext/extensions.proto";
+
 message Config {
+  option (v2ray.core.common.protoext.message_opt).type = "outbound";
+  option (v2ray.core.common.protoext.message_opt).short_name = "loopback";
+
   string inbound_tag = 1;
 }