Init Commit

Backend/MotoresArgentinosV2.Core/Interfaces/ITokenService.cs

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+using MotoresArgentinosV2.Core.Entities;
+
+namespace MotoresArgentinosV2.Core.Interfaces;
+
+public interface ITokenService
+{
+    string GenerateJwtToken(User user);
+    RefreshToken GenerateRefreshToken(string ipAddress);
+    string GenerateMFACode(); // Legacy email code
+    
+    // TOTP (Google Authenticator)
+    string GenerateBase32Secret();
+    string GetQrCodeUri(string userEmail, string secret);
+    bool ValidateTOTP(string secret, string code);
+}