* files: shared modeler batch loop for video, doc, zim, archive
Paging, skip-ids, progress, and cancel yields live in
wrolpi.files.modeler.run_modeler_loop. Each module still owns select /
prepare / apply and its transaction style: video probes outside the write
lock, docs use one write per file with lock retries, zim and archive use
one write per page. Archive HTML that is not a SingleFile raises
SkipModeler so apply_indexers can claim it.
* files: quieter batch-modeler errors; drop unused imports
Break out of a batch page on InvalidRequestError after a flush failure
so the rest of the page does not each log the same poisoned session.
Re-raise PYTEST apply failures without a misleading commit-failure
message. Remove asyncio/List/OperationalError/PYTEST/Iterable leftovers
from docs, archive, and zim.
