Method AddLabel

backend/Controllers/TasksController.cs:317–336

(int id, int labelId)

    }

    [HttpPost("{id}/labels/{labelId}")]
    public async Task<IActionResult> AddLabel(int id, int labelId)
    {
        try
        {
            int userId = GetUserId();
            var result = await _taskService.AddLabelToTaskAsync(id, labelId, userId);
            if (!result) return NotFound();

            var task = await _taskService.GetTaskByIdAsync(id, userId);
            if (task != null)
            {
                await _hubContext.Clients.Group($"board_{task.BoardId}")
                    .SendAsync("TaskUpdated", task);
            }

            return Ok(task);
        }
        catch (UnauthorizedAccessException) { return Forbid(); }
    }

    [HttpDelete("{id}/labels/{labelId}")]
    public async Task<IActionResult> RemoveLabel(int id, int labelId)