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/Activation/RequestActivationCommandHandler.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore;
+using PnvPanel.Application.Auth;
+using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+using PnvPanel.Domain.Activation;
+
+namespace PnvPanel.Application.Activation;
+
+public sealed class RequestActivationCommandHandler(IAppDbContext dbContext, ICurrentUser currentUser)
+    : ICommandHandler<RequestActivationCommand, Result<ActivationRequestDto>>
+{
+    public async Task<Result<ActivationRequestDto>> Handle(RequestActivationCommand command, CancellationToken cancellationToken)
+    {
+        if (currentUser.UserId is not { } userId)
+            return Result.Failure<ActivationRequestDto>(AuthErrors.Unauthorized);
+
+        var hasPending = await dbContext.ActivationRequests
+            .AnyAsync(r => r.UserId == userId && r.Status == ActivationStatus.Pending, cancellationToken);
+
+        if (hasPending)
+            return Result.Failure<ActivationRequestDto>(ActivationErrors.AlreadyPending);
+
+        var request = ActivationRequest.Create(userId, command.Comment);
+        dbContext.ActivationRequests.Add(request);
+
+        return Result.Success(new ActivationRequestDto(request.Id, request.Comment, request.CreatedAt));
+    }
+}