first commit

RS_system/Services/IAuthService.cs

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+using Rs_system.Models;
+using Rs_system.Models.ViewModels;
+
+namespace Rs_system.Services;
+
+public interface IAuthService
+{
+    /// <summary>
+    /// Validates user credentials and returns the user if valid
+    /// </summary>
+    Task<Usuario?> ValidateUserAsync(string username, string password);
+    
+    /// <summary>
+    /// Registers a new user
+    /// </summary>
+    Task<(bool Success, string Message, Usuario? User)> RegisterUserAsync(RegisterViewModel model);
+    
+    /// <summary>
+    /// Gets the roles for a user
+    /// </summary>
+    Task<List<string>> GetUserRolesAsync(long userId);
+    
+    /// <summary>
+    /// Updates the last login timestamp
+    /// </summary>
+    Task UpdateLastLoginAsync(long userId);
+
+    /// <summary>
+    /// Checks if a user has a specific permission
+    /// </summary>
+    Task<bool> HasPermissionAsync(long userId, string permissionCode);
+}