- consumer.py: call __enter__ for new-style parsers so _tika_client and
_gotenberg_client are set before parse() is invoked
- views.py: use `with parser` (via nullcontext for old-style parsers) in
get_metadata so extract_metadata always runs inside a context manager
- tika.py: GotenbergClient added to ExitStack alongside TikaClient;
inline client creation removed from extract_metadata and _convert_to_pdf;
__exit__ uses ExitStack.close() instead of __exit__ pass-through
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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