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/Extensions/DtoExtensions.cs

@@ -4,13 +4,30 @@ using MediatR;
 
 namespace ECMJobRunner.WebCron.Extensions;
 
+/// <summary>
+/// Extension methods for profile DTOs to support Hangfire job operations.
+/// </summary>
 public static class DtoExtensions
 {
+    /// <summary>
+    /// Generates a unique Hangfire job identifier for a profile.
+    /// </summary>
+    /// <param name="profile">The profile configuration DTO.</param>
+    /// <returns>A unique job identifier in the format "profile-{Id}-{normalized-name}".</returns>
+    /// <example>
+    /// Example: profile with Id=123 and ProfileName="Import Data" 
+    /// returns "profile-123-import_data"
+    /// </example>
     public static string JobId(this CfgProfileDto profile)
     {
         return $"profile-{profile.Id}-{profile.ProfileName.Replace(' ', '_').ToLowerInvariant()}";
     }
 
+    /// <summary>
+    /// Converts a profile DTO to a DEX job batch command.
+    /// </summary>
+    /// <param name="profile">The profile configuration DTO.</param>
+    /// <returns>A <see cref="TriggeringDEXJobBatchCommand"/> ready to execute the profile job.</returns>
     public static TriggeringDEXJobBatchCommand ToJob(this CfgProfileDto profile)
     {
         return new TriggeringDEXJobBatchCommand