feat: implement cross-device reading progress synchronization using SignalR and remove legacy quiz generation services.

src/NexusReader.Application/Abstractions/Services/IAiGenerateQuizService.cs

@@ -1,9 +0,0 @@
-using FluentResults;
-using NexusReader.Application.Queries.Quiz;
-
-namespace NexusReader.Application.Abstractions.Services;
-
-public interface IAiGenerateQuizService
-{
-    Task<Result<QuizDto>> GenerateQuizAsync(string contextBlockId, CancellationToken cancellationToken = default);
-}

src/NexusReader.Application/Commands/Sync/UpdateReadingProgressCommand.cs

@@ -0,0 +1,6 @@
+using FluentResults;
+using MediatR;
+
+namespace NexusReader.Application.Commands.Sync;
+
+public record UpdateReadingProgressCommand(string PageId, string UserId) : IRequest<Result>;

src/NexusReader.Application/Queries/Quiz/GetQuizQuestionsQuery.cs

@@ -1,5 +0,0 @@
-using NexusReader.Application.Abstractions.Messaging;
-
-namespace NexusReader.Application.Queries.Quiz;
-
-public record GetQuizQuestionsQuery(string ContextBlockId) : IQuery<QuizDto>;

src/NexusReader.Application/Queries/Quiz/GetQuizQuestionsQueryHandler.cs

@@ -1,20 +0,0 @@
-using FluentResults;
-using NexusReader.Application.Abstractions.Messaging;
-using NexusReader.Application.Abstractions.Services;
-
-namespace NexusReader.Application.Queries.Quiz;
-
-internal sealed class GetQuizQuestionsQueryHandler : IQueryHandler<GetQuizQuestionsQuery, QuizDto>
-{
-    private readonly IAiGenerateQuizService _aiService;
-
-    public GetQuizQuestionsQueryHandler(IAiGenerateQuizService aiService)
-    {
-        _aiService = aiService;
-    }
-
-    public async Task<Result<QuizDto>> Handle(GetQuizQuestionsQuery request, CancellationToken cancellationToken)
-    {
-        return await _aiService.GenerateQuizAsync(request.ContextBlockId, cancellationToken);
-    }
-}