Скорректирована выдача приглашений согласно бизнес-логике #568
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Описание изменений
/invites/ теперь всегда фильтрует по текущему пользователю, поле user из Meta.fields убрано
В выдаче остаются только активные приглашения: InviteList возвращает записи с is_accepted=None
POST /invites//accept/ стал идемпотентным: добавлены проверки на повторный приём/отказ, используется get_or_create для Collaborator, одинаковый ответ 409 для повторов.
Тестирование
Локально проверил, что прием приглашения даёт 200, повторный запрос — 409 с понятным сообщением об ошибке вместо 500.