Добавил слой Application

backend/UniVerse.Application/DTOs/Achievements/AchievementDtos.cs

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+namespace UniVerse.Application.DTOs.Achievements;
+
+public record AchievementDto(
+    int Id,
+    string Name,
+    string? Description,
+    string? IconUrl,
+    int XpReward,
+    int CoinReward,
+    string? Condition,
+    DateTime CreatedAt
+);
+
+public record UserAchievementDto(
+    int Id,
+    AchievementDto Achievement,
+    DateTime AwardedAt
+);
+
+public record CreateAchievementRequest(
+    string Name,
+    string? Description,
+    string? IconUrl,
+    int XpReward,
+    int CoinReward,
+    string? Condition
+);
+
+public record UpdateAchievementRequest(
+    string Name,
+    string? Description,
+    string? IconUrl,
+    int XpReward,
+    int CoinReward,
+    string? Condition
+);

backend/UniVerse.Application/DTOs/Auth/AuthDtos.cs

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+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Auth;
+
+public record AuthResponse(string AccessToken, DateTime ExpiresAt, UserAuthDto User);
+
+public record UserAuthDto(int Id, string Email, string? DisplayName, UserRole Role);
+
+public record LoginMicrosoftRequest(string AuthorizationCode);
+
+public record DevLoginRequest(string Email, string? DisplayName = null, UserRole Role = UserRole.Student);

backend/UniVerse.Application/DTOs/Common/PaginationDtos.cs

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+namespace UniVerse.Application.DTOs.Common;
+
+public record PaginationRequest(int Page = 1, int PageSize = 20);
+
+public record PagedResult<T>(
+    List<T> Items,
+    int TotalCount,
+    int Page,
+    int PageSize,
+    int TotalPages
+)
+{
+    public static PagedResult<T> Create(List<T> items, int totalCount, int page, int pageSize)
+    {
+        var totalPages = (int)Math.Ceiling(totalCount / (double)pageSize);
+        return new PagedResult<T>(items, totalCount, page, pageSize, totalPages);
+    }
+}

backend/UniVerse.Application/DTOs/Courses/CourseDtos.cs

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+using UniVerse.Application.DTOs.Tags;
+
+namespace UniVerse.Application.DTOs.Courses;
+
+public record CourseDto(
+    int Id,
+    string Name,
+    string? Description,
+    bool IsSynced,
+    List<TagDto> Tags,
+    DateTime CreatedAt
+);
+
+public record CreateCourseRequest(string Name, string? Description);
+
+public record UpdateCourseRequest(string Name, string? Description);
+
+public record CourseFilterRequest(
+    int? TagId,
+    string? Search,
+    bool? IsSynced,
+    int Page = 1,
+    int PageSize = 20
+);

backend/UniVerse.Application/DTOs/Gamification/GamificationDtos.cs

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+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Gamification;
+
+public record CoinTransactionDto(
+    int Id,
+    int Amount,
+    CoinTransactionType Type,
+    int? ReviewId,
+    int? AchievementId,
+    string? Description,
+    DateTime CreatedAt
+);

backend/UniVerse.Application/DTOs/Lectures/LectureDtos.cs

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+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Lectures;
+
+public record LectureDto(
+    int Id,
+    int CourseId,
+    string CourseName,
+    int? TeacherId,
+    string? TeacherName,
+    int? LocationId,
+    string? LocationName,
+    string Title,
+    string? Description,
+    LectureFormat Format,
+    DateTime StartsAt,
+    DateTime EndsAt,
+    bool IsOpen,
+    int MaxEnrollments,
+    int EnrollmentsCount,
+    string? OnlineUrl,
+    DateTime CreatedAt
+);
+
+public record LectureDetailDto(
+    int Id,
+    int CourseId,
+    string CourseName,
+    int? TeacherId,
+    string? TeacherName,
+    int? LocationId,
+    string? LocationName,
+    string Title,
+    string? Description,
+    LectureFormat Format,
+    DateTime StartsAt,
+    DateTime EndsAt,
+    bool IsOpen,
+    int MaxEnrollments,
+    int EnrollmentsCount,
+    string? OnlineUrl,
+    DateTime CreatedAt,
+    bool IsEnrolled
+);
+
+public record CreateLectureRequest(
+    int CourseId,
+    int? TeacherId,
+    int? LocationId,
+    string Title,
+    string? Description,
+    LectureFormat Format,
+    DateTime StartsAt,
+    DateTime EndsAt,
+    bool IsOpen,
+    int MaxEnrollments,
+    string? OnlineUrl
+);
+
+public record UpdateLectureRequest(
+    int? TeacherId,
+    int? LocationId,
+    string Title,
+    string? Description,
+    LectureFormat Format,
+    DateTime StartsAt,
+    DateTime EndsAt,
+    bool IsOpen,
+    int MaxEnrollments,
+    string? OnlineUrl
+);
+
+public record LectureFilterRequest(
+    DateOnly? DateFrom,
+    DateOnly? DateTo,
+    int? CourseId,
+    int? TeacherId,
+    LectureFormat? Format,
+    bool? IsOpen,
+    int? TagId,
+    string? Search,
+    int Page = 1,
+    int PageSize = 20
+);
+
+public record EnrollmentDto(int Id, int UserId, string? UserName, string? UserEmail, bool Attended, DateTime CreatedAt);

backend/UniVerse.Application/DTOs/Locations/LocationDtos.cs

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+namespace UniVerse.Application.DTOs.Locations;
+
+public record LocationDto(int Id, string Name, string? Building, string? Room, string? Address, DateTime CreatedAt);
+
+public record CreateLocationRequest(string Name, string? Building, string? Room, string? Address);
+
+public record UpdateLocationRequest(string Name, string? Building, string? Room, string? Address);

backend/UniVerse.Application/DTOs/Reviews/ReviewDtos.cs

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+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Reviews;
+
+public record ReviewDto(
+    int Id,
+    int LectureId,
+    string? LectureTitle,
+    int UserId,
+    string? UserName,
+    ReviewRating Rating,
+    string? Text,
+    ReviewLlmStatus LlmStatus,
+    ReviewSentiment? Sentiment,
+    double? QualityScore,
+    bool? IsInformative,
+    string[]? LlmTags,
+    DateTime CreatedAt
+);
+
+public record CreateReviewRequest(int LectureId, ReviewRating Rating, string? Text);
+
+public record UpdateReviewRequest(ReviewRating Rating, string? Text);

backend/UniVerse.Application/DTOs/Sync/SyncDtos.cs

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+namespace UniVerse.Application.DTOs.Sync;
+
+public record SyncScheduleRequest(
+    string? SpecialtyCode,
+    DateTime? TimeMin,
+    DateTime? TimeMax,
+    string? TypeId
+);
+
+public record SyncResultDto(int Created, int Updated, int Skipped, string? Error);
+
+public record SyncStatusDto(DateTime? LastSyncAt, string Status, SyncResultDto? LastResult);
+
+public record EmployeeDto(string? Id, string FullName, string? Department);

backend/UniVerse.Application/DTOs/Tags/TagDtos.cs

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+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Tags;
+
+public record TagDto(int Id, string Name, TagType Type, int? ParentId, DateTime CreatedAt);
+
+public record TagTreeDto(int Id, string Name, TagType Type, List<TagTreeDto> Children);
+
+public record CreateTagRequest(string Name, TagType Type, int? ParentId);
+
+public record UpdateTagRequest(string Name, TagType Type, int? ParentId);

backend/UniVerse.Application/DTOs/Users/UserDtos.cs

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+using UniVerse.Domain.Enums;
+
+namespace UniVerse.Application.DTOs.Users;
+
+public record UserDto(
+    int Id,
+    string Email,
+    string? DisplayName,
+    string? AvatarUrl,
+    UserRole Role,
+    bool IsActive,
+    int Xp,
+    int Coins,
+    int Level,
+    DateTime CreatedAt
+);
+
+public record UserStatsDto(
+    int TotalLectures,
+    int AttendedLectures,
+    int TotalReviews,
+    int Xp,
+    int Coins,
+    int Level,
+    int AchievementsCount
+);
+
+public record UpdateUserRequest(
+    string? DisplayName,
+    string? AvatarUrl
+);
+
+public record UserFilterRequest(
+    string? Search,
+    UserRole? Role,
+    bool? IsActive,
+    int Page = 1,
+    int PageSize = 20
+);
+
+public record StudentProfileDto(
+    int Id,
+    string? StudentId,
+    string? GroupName,
+    int? EnrollmentYear,
+    string? Faculty,
+    string? Specialty
+);
+
+public record TeacherProfileDto(
+    int Id,
+    string? Department,
+    string? Title,
+    string? Bio
+);