Add JWT authentication and role-based authorization

src/Hospitality.Backend/Services/IAuthService.cs

@@ -0,0 +1,10 @@
+using Hospitality.Backend.DTOs;
+
+namespace Hospitality.Backend.Services;
+
+public interface IAuthService
+{
+    Task<LoginResponse?> LoginAsync(LoginRequest request);
+    Task<bool> RegisterAsync(RegisterRequest request);
+    Task<UserInfoResponse?> GetUserInfoAsync(string email);
+}