feat(backend): настраиваемая LLM для конвертации PDF в JSON

- Добавлена переменная LLM_MODEL в конфиг
- Увеличен max_tokens до 32768 для крупных выписок
- Включен response_format: json_object
- Добавлен скрипт test:llm для проверки подключения к LLM-серверу

package-lock.json

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