Update license headers across the codebase to SPDX format and add copyright information

- Added SPDX license header and copyright notice to multiple C# files in the EasyExtensions project.
- Introduced a new script (UpdateLicense.cs) to automate the process of updating license headers in C# files.
- Ensured that the copyright year reflects the current year range.
- Excluded certain files from being processed to avoid unnecessary changes.

Author: bvdcode

Sources/EasyExtensions.AspNetCore.Authorization/Abstractions/IClaimProvider.cs

@@ -1,4 +1,7 @@
-using System.Collections.Generic;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using System.Collections.Generic;
 using System.Security.Claims;
 
 namespace EasyExtensions.AspNetCore.Authorization.Abstractions

Sources/EasyExtensions.AspNetCore.Authorization/Abstractions/ITokenProvider.cs

@@ -1,4 +1,7 @@
-using EasyExtensions.AspNetCore.Authorization.Builders;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using EasyExtensions.AspNetCore.Authorization.Builders;
 using Microsoft.IdentityModel.Tokens;
 using System;
 
@@ -54,4 +57,4 @@ public interface ITokenProvider
         /// <returns> True if token is valid, false otherwise. </returns>
         bool ValidateToken(string token);
     }
-}
+}

Sources/EasyExtensions.AspNetCore.Authorization/Builders/ClaimBuilder.cs

@@ -1,4 +1,7 @@
-using System;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using System;
 using System.Collections.Generic;
 using System.Security.Claims;
 
@@ -69,4 +72,4 @@ public Claim[] Build()
             return [.. _claims];
         }
     }
-}
+}

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

@@ -1,4 +1,7 @@
-using EasyExtensions.Abstractions;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using EasyExtensions.Abstractions;
 using EasyExtensions.AspNetCore.Authorization.Abstractions;
 using EasyExtensions.AspNetCore.Authorization.Models.Dto;
 using EasyExtensions.AspNetCore.Extensions;

Sources/EasyExtensions.AspNetCore.Authorization/Extensions/ConfigurationExtensions.cs

@@ -1,4 +1,7 @@
-using EasyExtensions.AspNetCore.Authorization.Models;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using EasyExtensions.AspNetCore.Authorization.Models;
 using EasyExtensions.Helpers;
 using Microsoft.Extensions.Configuration;
 using Microsoft.IdentityModel.Tokens;

Sources/EasyExtensions.AspNetCore.Authorization/Extensions/ServiceCollectionExtensions.cs

@@ -1,4 +1,7 @@
-using EasyExtensions.AspNetCore.Authorization.Abstractions;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using EasyExtensions.AspNetCore.Authorization.Abstractions;
 using EasyExtensions.AspNetCore.Authorization.Handlers;
 using EasyExtensions.AspNetCore.Authorization.Services;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
@@ -117,4 +120,4 @@ public static IServiceCollection AllowAnonymousOnDevelopment(this IServiceCollec
             return services;
         }
     }
-}
+}

Sources/EasyExtensions.AspNetCore.Authorization/Handlers/AllowAnonymousAuthorizationHandler.cs

@@ -1,4 +1,7 @@
-using Microsoft.AspNetCore.Authorization;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using Microsoft.AspNetCore.Authorization;
 using System.Threading.Tasks;
 
 namespace EasyExtensions.AspNetCore.Authorization.Handlers
@@ -22,4 +25,4 @@ public Task HandleAsync(AuthorizationHandlerContext context)
             return Task.CompletedTask;
         }
     }
-}
+}

Sources/EasyExtensions.AspNetCore.Authorization/Models/Dto/ChangePasswordRequestDto.cs

@@ -1,4 +1,7 @@
-using System.ComponentModel.DataAnnotations;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using System.ComponentModel.DataAnnotations;
 
 namespace EasyExtensions.AspNetCore.Authorization.Models.Dto
 {

Sources/EasyExtensions.AspNetCore.Authorization/Models/Dto/GoogleOpenIdResponseDto.cs

@@ -1,4 +1,7 @@
-using System.Text.Json.Serialization;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using System.Text.Json.Serialization;
 
 namespace EasyExtensions.AspNetCore.Authorization.Models.Dto
 {

Sources/EasyExtensions.AspNetCore.Authorization/Models/Dto/LoginRequestDto.cs

@@ -1,4 +1,7 @@
-using System.ComponentModel.DataAnnotations;
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025–2026 Vadim Belov <https://belov.us>
+
+using System.ComponentModel.DataAnnotations;
 
 namespace EasyExtensions.AspNetCore.Authorization.Models.Dto
 {