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fix(ext): normalize weak ETags in If-Match before invenio-rest check

nginx converts strong ETags ("N") to weak ETags (W/"N") when applying gzip
compression, which is correct per RFC 7232. invenio-rest's check_etag()
silently ignores weak ETags in If-Match (as_set(include_weak=False) returns
empty), causing If-Match checks to be bypassed entirely in production.

A before_request hook strips the W/ prefix to restore strong ETag semantics
before check_etag() is called. The proper fix belongs upstream in invenio-rest.
Confirmed the same issue exists on Zenodo (InvenioRDM).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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