Enhance documentation with new features: added dark/light/system theme support, instructions page, and application catalog. Updated API and domain model for app management and automatic migrations on startup. Improved frontend structure with new routes and features for user instructions and app management.

backend/src/PnvPanel.Application/DependencyInjection.cs

@@ -0,0 +1,44 @@
+using System.Reflection;
+using FluentValidation;
+using Microsoft.Extensions.DependencyInjection;
+using PnvPanel.Application.Common.Behaviors;
+using PnvPanel.Application.Common.Messaging;
+
+namespace PnvPanel.Application;
+
+/// <summary>
+/// Точка регистрации сервисов слоя Application: собственный CQRS-диспетчер (ISender),
+/// хендлеры/валидаторы (авто-сканирование сборки) и pipeline behaviors — в порядке выполнения.
+/// </summary>
+public static class DependencyInjection
+{
+    public static IServiceCollection AddApplication(this IServiceCollection services)
+    {
+        var assembly = typeof(DependencyInjection).Assembly;
+
+        services.AddScoped<ISender, Sender>();
+
+        RegisterClosedGeneric(services, assembly, typeof(ICommandHandler<,>));
+        RegisterClosedGeneric(services, assembly, typeof(IQueryHandler<,>));
+        RegisterClosedGeneric(services, assembly, typeof(IValidator<>));
+
+        // Порядок важен: Logging (снаружи) -> Validation -> UnitOfWork (ближе к хендлеру).
+        services.AddScoped(typeof(IPipelineBehavior<,>), typeof(LoggingBehavior<,>));
+        services.AddScoped(typeof(IPipelineBehavior<,>), typeof(ValidationBehavior<,>));
+        services.AddScoped(typeof(IPipelineBehavior<,>), typeof(UnitOfWorkBehavior<,>));
+
+        return services;
+    }
+
+    private static void RegisterClosedGeneric(IServiceCollection services, Assembly assembly, Type openInterface)
+    {
+        var implementations = assembly.GetTypes()
+            .Where(t => t is { IsClass: true, IsAbstract: false })
+            .SelectMany(t => t.GetInterfaces()
+                .Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == openInterface)
+                .Select(i => (Service: i, Implementation: t)));
+
+        foreach (var (service, implementation) in implementations)
+            services.AddScoped(service, implementation);
+    }
+}