Initial commit

MealPlan.Api/DTOs/Auth/LoginRequestDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MealPlan.Api.DTOs.Auth;
+
+/// <summary>Credentials submitted to <c>POST /api/auth/login</c>.</summary>
+public class LoginRequestDto
+{
+    [Required]
+    [EmailAddress]
+    [MaxLength(256)]
+    public string Email { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(256)]
+    public string Password { get; set; } = string.Empty;
+}

MealPlan.Api/DTOs/Auth/RefreshRequestDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MealPlan.Api.DTOs.Auth;
+
+/// <summary>Body for <c>POST /api/auth/refresh</c> and <c>POST /api/auth/logout</c>.</summary>
+public class RefreshRequestDto
+{
+    [Required]
+    public string RefreshToken { get; set; } = string.Empty;
+}

MealPlan.Api/DTOs/Auth/RegisterRequestDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MealPlan.Api.DTOs.Auth;
+
+/// <summary>Payload for <c>POST /api/auth/register</c>.</summary>
+public class RegisterRequestDto
+{
+    [Required]
+    [EmailAddress]
+    [MaxLength(256)]
+    public string Email { get; set; } = string.Empty;
+
+    [MaxLength(256)]
+    public string? UserName { get; set; }
+
+    [Required]
+    [MinLength(8)]
+    [MaxLength(256)]
+    public string Password { get; set; } = string.Empty;
+}

MealPlan.Api/DTOs/Auth/TokenResponseDto.cs

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+namespace MealPlan.Api.DTOs.Auth;
+
+/// <summary>Token pair returned by login and refresh.</summary>
+public class TokenResponseDto
+{
+    public string AccessToken { get; set; } = string.Empty;
+    public string RefreshToken { get; set; } = string.Empty;
+
+    /// <summary>Access-token lifetime in seconds (clients use it to schedule silent refresh).</summary>
+    public int ExpiresInSeconds { get; set; }
+
+    public string TokenType { get; set; } = "Bearer";
+}

MealPlan.Api/DTOs/Auth/UserInfoDto.cs

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+namespace MealPlan.Api.DTOs.Auth;
+
+/// <summary>Current-user payload returned by <c>GET /api/auth/me</c>.</summary>
+public class UserInfoDto
+{
+    public string Id { get; set; } = string.Empty;
+    public string? UserName { get; set; }
+    public string? Email { get; set; }
+}