Make RefreshToken nullable; remove unused auth models

Changed RefreshToken in TokenPairDto to nullable string.
Removed obsolete model files: LoginResponse, RefreshTokenRequest,
and UsernameLoginRequest. These models are no longer used.

Author: Vadim Belov

Sources/EasyExtensions.AspNetCore.Authorization/Controllers/BaseAuthController.cs

@@ -108,7 +108,7 @@ public async Task<IActionResult> RefreshToken([FromBody] RefreshTokenRequestDto?
                 SameSite = Microsoft.AspNetCore.Http.SameSiteMode.Strict,
                 Expires = DateTimeOffset.UtcNow.Add(GetCookieExpirationTime()),
             });
-            return Ok(new TokenPairDto
+            return Ok(new TokenPairResponseDto
             {
                 AccessToken = accessToken,
                 RefreshToken = useCookie ? StringHelpers.CreateRandomString(64) : newRefreshToken
@@ -123,7 +123,7 @@ public async Task<IActionResult> RefreshToken([FromBody] RefreshTokenRequestDto?
         /// re-entering credentials. Repeated failed login attempts may be subject to rate limiting or account lockout
         /// policies, depending on system configuration.</remarks>
         /// <param name="request">The login request containing the user's username and password. Cannot be null.</param>
-        /// <returns>An <see cref="IActionResult"/> containing a <see cref="TokenPairDto"/> with access and refresh tokens if
+        /// <returns>An <see cref="IActionResult"/> containing a <see cref="TokenPairResponseDto"/> with access and refresh tokens if
         /// authentication is successful; otherwise, an unauthorized response if the credentials are invalid.</returns>
         [HttpPost("login")]
         public async Task<IActionResult> Login([FromBody] LoginRequestDto request)
@@ -164,7 +164,7 @@ public async Task<IActionResult> Login([FromBody] LoginRequestDto request)
                 SameSite = Microsoft.AspNetCore.Http.SameSiteMode.Strict,
                 Expires = DateTimeOffset.UtcNow.Add(GetCookieExpirationTime()),
             });
-            return Ok(new TokenPairDto
+            return Ok(new TokenPairResponseDto
             {
                 AccessToken = accessToken,
                 RefreshToken = refreshToken
@@ -180,7 +180,7 @@ public async Task<IActionResult> Login([FromBody] LoginRequestDto request)
         /// The method issues new tokens and revokes any previous refresh tokens for the user.</remarks>
         /// <param name="token">The Google OAuth access token to use for retrieving user information. Must be a valid token issued by
         /// Google.</param>
-        /// <returns>An <see cref="IActionResult"/> containing a <see cref="TokenPairDto"/> with access and refresh tokens if
+        /// <returns>An <see cref="IActionResult"/> containing a <see cref="TokenPairResponseDto"/> with access and refresh tokens if
         /// authentication is successful; otherwise, an unauthorized response if authentication fails or the user's
         /// email is not verified.</returns>
         /// <exception cref="InvalidOperationException">Thrown if user information cannot be retrieved from Google using the provided token.</exception>
@@ -220,7 +220,7 @@ public async Task<IActionResult> LoginWithGoogle([FromQuery] string token)
                 SameSite = Microsoft.AspNetCore.Http.SameSiteMode.Strict,
                 Expires = DateTimeOffset.UtcNow.Add(GetCookieExpirationTime()),
             });
-            return Ok(new TokenPairDto
+            return Ok(new TokenPairResponseDto
             {
                 AccessToken = accessToken,
                 RefreshToken = refreshToken

…Authorization/Models/Dto/TokenPairDto.cs …ation/Models/Dto/TokenPairResponseDto.csSources/EasyExtensions.AspNetCore.Authorization/Models/Dto/TokenPairDto.cs renamed to Sources/EasyExtensions.AspNetCore.Authorization/Models/Dto/TokenPairResponseDto.cs Sources/EasyExtensions.AspNetCore.Authorization/Models/Dto/TokenPairDto.cs renamed to Sources/EasyExtensions.AspNetCore.Authorization/Models/Dto/TokenPairResponseDto.cs

@@ -6,7 +6,7 @@
     /// <remarks>A token pair typically consists of an access token, which is used to authorize API requests,
     /// and a refresh token, which can be used to obtain a new access token when the current one expires. This class is
     /// commonly used in authentication flows that require token management.</remarks>
-    public class TokenPairDto
+    public class TokenPairResponseDto
     {
         /// <summary>
         /// Gets or sets the OAuth 2.0 access token used for authenticating API requests.
@@ -16,6 +16,6 @@ public class TokenPairDto
         /// <summary>
         /// Gets or sets the refresh token used to obtain a new access token when the current one expires.
         /// </summary>
-        public string RefreshToken { get; set; } = null!;
+        public string? RefreshToken { get; set; } = null!;
     }
 }