[DidoraRudenko]

What was done

• Pagination: Created PagedResult<T> and PaginationExtensions helpers. The GET /api/interviews endpoint now returns paginated data (page, pageSize, totalCount) to optimize database queries.
• Validation (AI Token Protection): Added [Required] and [MaxLength(3000)] attributes to SendMessageDto. The API now automatically returns a 400 Bad Request for empty or excessively long messages to prevent spam.
• Security (Data Isolation): Set up session owner verification. Attempting to access another user's interview safely returns a 404 Not Found.
• JWT Authentication: Configured Supabase token validation, resolving the persistent 401 Unauthorized issue.

[oleksandkov]

Resolve confilicts, please, and be a good boy

Resolved