fix: лекции когда возвращались не говорили записан ли студент уже или нет

backend/UniVerse.Infrastructure/Services/LectureService.cs

@@ -24,7 +24,7 @@ public class LectureService : ILectureService
         .Include(l => l.Course).Include(l => l.Teacher)
         .Include(l => l.Location).Include(l => l.Enrollments);
 
-    public async Task<PagedResult<LectureDto>> GetAllAsync(LectureFilterRequest filter)
+    public async Task<PagedResult<LectureDto>> GetAllAsync(LectureFilterRequest filter, int? currentUserId = null)
     {
         var query = BaseQuery();
         if (filter.CourseId.HasValue) query = query.Where(l => l.CourseId == filter.CourseId);
@@ -43,7 +43,11 @@ public class LectureService : ILectureService
         var total = await query.CountAsync();
         var items = await query.OrderBy(l => l.StartsAt)
             .Skip((filter.Page - 1) * filter.PageSize).Take(filter.PageSize).ToListAsync();
-        return PagedResult<LectureDto>.Create(items.Select(l => l.ToDto()).ToList(), total, filter.Page, filter.PageSize);
+        return PagedResult<LectureDto>.Create(
+            items.Select(l => l.ToDto(currentUserId.HasValue && l.Enrollments.Any(e => e.UserId == currentUserId.Value))).ToList(),
+            total,
+            filter.Page,
+            filter.PageSize);
     }
 
     public async Task<LectureDetailDto> GetByIdAsync(int id, int? currentUserId = null)