GET /api/v2/system/queue/status returns counts of documents
by processing_status (waiting/processing) from leaudit_documents,
plus processing document IDs for the frontend progress display.
- GET /api/document-types: returns {id, name, code} from
leaudit_document_types, with optional ?ids=1,2,3 filter
- GET /api/documents/list: added userId, dateFrom, dateTo
query params for filtering by uploading user and date range