Feature(Auth): Add Login and Refresh Token

RT.Application/Services/Contract/ITokenService.cs

@@ -0,0 +1,7 @@
+namespace RT.Application.Services.Contract;
+
+public interface ITokenService
+{
+    (string token, DateTime expiresAt) GenerateToken(string userId, string email, string userName);
+    (string token, DateTime expiresAt) GenerateRefreshToken();
+}