chore(api)!: refactored grpc API

api/proto/auth.proto

@@ -6,10 +6,7 @@ option go_package = "pkg/api/auth";
 service AuthService {
   rpc SignUp(SignUpRequest) returns (SignUpResponse);
   rpc SignIn(SignInRequest) returns (SignInResponse);
-  rpc GetMe(GetMeRequest) returns (GetMeResponse);
-  rpc GetUser(GetUserRequest) returns (GetUserResponse);
-  rpc GetMyStat(GetMyStatRequest) returns (GetMyStatResponse);
-  rpc GetLeaderboard(GetLeaderboardRequest) returns (GetLeaderboardResponse);
+  rpc ValidateToken(ValidateTokenRequest) returns (ValidateTokenResponse);
 }
 
 message SignUpRequest {
@@ -29,46 +26,9 @@ message SignInResponse {
   string token = 1;
 }
 
-message GetMeRequest {}
-message GetMeResponse {
-  User user = 1;
+message ValidateTokenRequest {
+  string token = 1;
 }
-
-message GetUserRequest {
+message ValidateTokenResponse {
   string user_id = 1;
 }
-message GetUserResponse {
-  User user = 1;
-}
-
-message GetMyStatRequest {}
-message GetMyStatResponse {
-  Stat stat = 1;
-}
-
-message GetLeaderboardRequest {}
-message GetLeaderboardResponse {
-  repeated User users = 1;
-}
-
-message User {
-  optional string id = 1;
-  string email = 2;
-  string username = 3;
-  optional string avatar = 4;
-  string created_at = 5;
-  repeated UserAchievement achievements = 6;
-}
-
-message UserAchievement {
-  string name = 1;
-  string description = 2;
-  string icon = 3;
-  string received_at = 4;
-}
-
-message Stat {
-  int32 total_attempts = 1;
-  int32 solved_tasks = 2;
-}
-