feat: add LoginRequest and LoginResponse DTOs

API/ROLAC.API/DTOs/Auth/LoginRequest.cs

@@ -0,0 +1,16 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace ROLAC.API.DTOs.Auth;
+
+public class LoginRequest
+{
+    [Required]
+    [EmailAddress]
+    [MaxLength(256)]
+    public string Email { get; set; } = null!;
+
+    [Required]
+    [MinLength(8)]
+    [MaxLength(128)]
+    public string Password { get; set; } = null!;
+}

API/ROLAC.API/DTOs/Auth/LoginResponse.cs

@@ -0,0 +1,20 @@
+namespace ROLAC.API.DTOs.Auth;
+
+public class LoginResponse
+{
+    /// <summary>Short-lived JWT (15 min). Store in memory — never in localStorage.</summary>
+    public string AccessToken { get; set; } = null!;
+
+    /// <summary>Seconds until the access token expires. Always 900 (15 × 60).</summary>
+    public int ExpiresIn { get; set; }
+
+    public UserInfo User { get; set; } = null!;
+}
+
+public class UserInfo
+{
+    public string Id                 { get; set; } = null!;
+    public string Email              { get; set; } = null!;
+    public IList<string> Roles       { get; set; } = [];
+    public string LanguagePreference { get; set; } = "en";
+}