Add auth.proto file for user registration and login messages

Author: leogenius360

shared/proto/auth.proto

@@ -0,0 +1,41 @@
+syntax = "proto3";
+
+package geniustechspace.shared.v1;
+
+import "google/protobuf/timestamp.proto";
+
+message UserRegistrationRequest {
+  string username = 1;
+  optional string email = 2;
+  optional string phone_number = 3;
+  optional string password = 4;
+}
+
+message UserRegistrationSuccess {
+  string user_id = 1;
+  string message = 2;
+}
+
+message UserLoginRequest {
+  string username = 1;
+  string password = 2;
+}
+
+message UserLoginSuccess {
+  User user = 1;
+  repeated AuthToken token = 2;
+  string message = 3;
+}
+
+message AuthToken {
+  string context = 1; // access, refresh, etc.
+  string token = 2;
+  google.protobuf.Timestamp expiry = 3;
+}
+
+message TokenPayload {
+  string user_id = 1;
+  string token_id = 2;
+  repeated string scopes = 4;
+  google.protobuf.Timestamp expiry = 5;
+}