Add XML documentation for improved code clarity

Added detailed XML documentation across multiple files to enhance
code maintainability and readability. Key updates include:

- Documented `AllowAllDashboardAuthorizationFilter` to clarify
  its development-only usage.
- Added comments to `DtoExtensions` for Hangfire job ID generation
  and DTO-to-command conversion methods.
- Enhanced `HealthCheckHtmlGenerator` with detailed descriptions
  of HTML generation methods and utility functions.
- Documented `DependencyInjection` and `ProfileWorkerOptionsValidator`
  to explain service registration and configuration validation.
- Updated `ProfileCache` with comments on thread-safe operations.
- Added documentation to `ProfileWork` for profile synchronization
  logic and execution flow.
- Enhanced `ProfileWorker` with health check logic and background
  service execution details.
- Documented `ProfileWorkerOptions` configuration properties.

These changes aim to improve developer understanding and ensure
best practices are followed in production environments.

ECMJobRunner.WebCron/ProfileWorker/DependencyInjection.cs

@@ -2,8 +2,26 @@
 
 namespace ECMJobRunner.WebCron.ProfileWorker;
 
+/// <summary>
+/// Extension methods for configuring ProfileWorker services in the DI container.
+/// </summary>
 public static class DependencyInjection
 {
+    /// <summary>
+    /// Registers ProfileWorker background service and related dependencies.
+    /// </summary>
+    /// <param name="services">The service collection to configure.</param>
+    /// <param name="configuration">Application configuration containing ProfileWorker settings.</param>
+    /// <returns>The configured service collection for method chaining.</returns>
+    /// <remarks>
+    /// Registers the following services:
+    /// <list type="bullet">
+    /// <item><description><see cref="ProfileWorkerOptions"/> - Configuration options from appsettings.json</description></item>
+    /// <item><description><see cref="ProfileWorker"/> - Singleton background service (also registered as IHostedService)</description></item>
+    /// <item><description><see cref="ProfileCache"/> - Singleton cache for profile state</description></item>
+    /// <item><description><see cref="ProfileWork"/> - Scoped service for profile synchronization logic</description></item>
+    /// </list>
+    /// </remarks>
     public static IServiceCollection AddProfileWorker(this IServiceCollection services, IConfiguration configuration)
     {
         // Configure ProfileWorker options from appsettings.json
@@ -25,10 +43,27 @@ public static class DependencyInjection
 }
 
 /// <summary>
-/// Validates ProfileWorkerOptions configuration at startup.
+/// Validates <see cref="ProfileWorkerOptions"/> configuration at application startup.
+/// Ensures IntervalMS is within acceptable bounds to prevent misconfiguration.
 /// </summary>
 internal class ProfileWorkerOptionsValidator : IValidateOptions<ProfileWorkerOptions>
 {
+    /// <summary>
+    /// Validates the ProfileWorker options.
+    /// </summary>
+    /// <param name="name">The name of the options instance (not used).</param>
+    /// <param name="options">The options to validate.</param>
+    /// <returns>
+    /// <see cref="ValidateOptionsResult.Success"/> if valid, 
+    /// or <see cref="ValidateOptionsResult.Fail"/> with error message if invalid.
+    /// </returns>
+    /// <remarks>
+    /// Validation rules:
+    /// <list type="bullet">
+    /// <item><description>IntervalMS must be greater than 0</description></item>
+    /// <item><description>IntervalMS should be at least 100ms to avoid excessive CPU usage</description></item>
+    /// </list>
+    /// </remarks>
     public ValidateOptionsResult Validate(string? name, ProfileWorkerOptions options)
     {
         if (options.IntervalMS <= 0)