Initial commit

MealPlan.Api/Models/RefreshToken.cs

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+namespace MealPlan.Api.Models;
+
+/// <summary>
+/// In-memory refresh token record. Stored in a singleton store rather than the database,
+/// because the existing schema must not be modified and no migrations may be created.
+/// Rotation: every successful refresh invalidates the previous token and issues a new one.
+/// </summary>
+public class RefreshToken
+{
+    public string Token { get; set; } = string.Empty;
+    public string UserId { get; set; } = string.Empty;
+    public DateTime ExpiresAtUtc { get; set; }
+    public DateTime CreatedAtUtc { get; set; }
+    public bool IsRevoked { get; set; }
+
+    public bool IsActive => !IsRevoked && DateTime.UtcNow < ExpiresAtUtc;
+}