feat 协议移动到Public

Public/Proto/ServerInternal/sources/service_gateway.proto

@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+option go_package = "common/proto/ss/grpc_pb";
+import "ss_common.proto";
+
+service Gateway {
+  rpc ToClient(stream ToClientReq) returns (ToClientResp) {}
+}
+
+message ToClientReq {
+  int32 UID = 1;
+  int32 MessageID = 2;
+  bytes Payload = 3;
+}
+
+message ToClientResp {
+}