Flexible document listing with aggregates, projections, and advanced pagination.
Supported operators: $and, $or, $nor, $not, $eq, $ne, $gt, $gte, $lt, $lte,
$in, $nin, $exists, $type, $regex, $contains.
Implicit equality (backwards compatible, JSONB containment):
{"status": "active"}
Explicit operators (typed comparisons for number, decimal, datetime, date):
{"priority": {"$gte": 40}, "end_date": {"$lt": "2025-01-01"}}
Use folder_name and end_user_id query parameters to scope system metadata.