feat: add authenticated engine processing boundary

site/services/extractor.py

@@ -252,7 +252,7 @@ def extract_document(document, llm_client=None, batch_id=None):
     """Извлечь паспорт одного документа, изолируя ошибки на уровне документа."""
     document_id = document["id"]
     batch_id = batch_id if batch_id is not None else document.get("batch_id")
-    elements = _decode_elements(document.get("elements_json"))
+    elements = _decode_elements(document.get("elements", document.get("elements_json")))
     structured_text = format_elements_with_structure(elements)
     raw_response = "{}"
     try:
@@ -306,13 +306,14 @@ def extract_document(document, llm_client=None, batch_id=None):
         return {"ok": False, "document_id": document_id, "error": str(error)}
 
 
-def extract_batch(batch_id, llm_client=None, progress_callback=None):
+def extract_batch(batch_id, llm_client=None, progress_callback=None, documents=None):
     """Обработать документы batch и вернуть сводку без batch-wide failure.
 
     Optional progress callback получает (completed_count, document_result) после
     каждого документа; ошибки callback не должны останавливать обработку batch.
     """
-    documents = db_docs.list_for_extraction(batch_id)
+    if documents is None:
+        documents = db_docs.list_for_extraction(batch_id)
     results = []
     for completed, document in enumerate(documents, start=1):
         result = extract_document(document, llm_client=llm_client, batch_id=batch_id)