Implement Codebreaker.Identity library and core components

Co-authored-by: christiannagel <1908285+christiannagel@users.noreply.github.com>

Author: Copilot

src/services/identity/Codebreaker.Identity.Tests/Codebreaker.Identity.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Moq" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Codebreaker.Identity\Codebreaker.Identity.csproj" />
+  </ItemGroup>
+
+</Project>

src/services/identity/Codebreaker.Identity.Tests/GlobalUsings.cs

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+global using Xunit;

src/services/identity/Codebreaker.Identity.Tests/UnitTest1.cs

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+namespace Codebreaker.Identity.Tests;
+
+public class UnitTest1
+{
+    [Fact]
+    public void Test1()
+    {
+
+    }
+}

src/services/identity/Codebreaker.Identity/Class1.cs

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+namespace Codebreaker.Identity;
+
+public class Class1
+{
+
+}

src/services/identity/Codebreaker.Identity/Codebreaker.Identity.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Graph" />
+    <PackageReference Include="Microsoft.Extensions.Options" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" />
+    <PackageReference Include="Azure.Identity" />
+  </ItemGroup>
+
+</Project>

src/services/identity/Codebreaker.Identity/Configuration/AnonymousUserOptions.cs

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+namespace Codebreaker.Identity.Configuration;
+
+/// <summary>
+/// Configuration options for anonymous users
+/// </summary>
+public class AnonymousUserOptions
+{
+    /// <summary>
+    /// Gets or sets the tenant ID for the Azure AD tenant
+    /// </summary>
+    public string TenantId { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the client ID for the Azure AD application used for graph operations
+    /// </summary>
+    public string ClientId { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the client secret for the Azure AD application
+    /// </summary>
+    public string ClientSecret { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the domain for anonymous users
+    /// </summary>
+    public string Domain { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the password policy for anonymous users
+    /// </summary>
+    public string PasswordPolicy { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the password length for anonymous users
+    /// </summary>
+    public int PasswordLength { get; set; } = 12;
+    
+    /// <summary>
+    /// Gets or sets the user name prefix for anonymous users
+    /// </summary>
+    public string UserNamePrefix { get; set; } = "anon";
+}

src/services/identity/Codebreaker.Identity/Extensions/ServiceCollectionExtensions.cs

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+using Codebreaker.Identity.Configuration;
+using Codebreaker.Identity.Services;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Codebreaker.Identity.Extensions;
+
+/// <summary>
+/// Extension methods to configure Codebreaker.Identity services
+/// </summary>
+public static class ServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds the anonymous user service to the service collection
+    /// </summary>
+    /// <param name="services">The service collection</param>
+    /// <returns>The service collection</returns>
+    public static IServiceCollection AddAnonymousUserService(this IServiceCollection services)
+    {
+        services.AddScoped<IAnonymousUserService, GraphAnonymousUserService>();
+        return services;
+    }
+    
+    /// <summary>
+    /// Adds the anonymous user service to the service collection with configuration
+    /// </summary>
+    /// <param name="services">The service collection</param>
+    /// <param name="configureOptions">The configuration action</param>
+    /// <returns>The service collection</returns>
+    public static IServiceCollection AddAnonymousUserService(
+        this IServiceCollection services,
+        Action<AnonymousUserOptions> configureOptions)
+    {
+        services.Configure(configureOptions);
+        services.AddScoped<IAnonymousUserService, GraphAnonymousUserService>();
+        return services;
+    }
+}

src/services/identity/Codebreaker.Identity/Models/AnonymousUser.cs

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+namespace Codebreaker.Identity.Models;
+
+/// <summary>
+/// Represents an anonymous user with access credentials
+/// </summary>
+public class AnonymousUser
+{
+    /// <summary>
+    /// Gets or sets the user's unique identifier
+    /// </summary>
+    public string Id { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the user name
+    /// </summary>
+    public string UserName { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the display name
+    /// </summary>
+    public string DisplayName { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the email address
+    /// </summary>
+    public string Email { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the password
+    /// </summary>
+    public string Password { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Gets or sets the creation date
+    /// </summary>
+    public DateTimeOffset CreatedAt { get; set; } = DateTimeOffset.UtcNow;
+    
+    /// <summary>
+    /// Gets or sets the last login date
+    /// </summary>
+    public DateTimeOffset? LastLoginAt { get; set; }
+}