fix: prefer IANA vCard extensions

[vibhor-aggr]

Fixes #388.

This updates the IANA import path so text/vcard receives the registered .vcf and .vcard extensions from the current IANA registration instead of leaving .vcf only on the deprecated Apache text/x-vcard entry.

The parser change is intentionally narrow: it handles IANA's vCard registration format where File extension(s): .vcf .vcard appears after other text, while preserving the existing numbered-extension handling used by other records.

Verification:

• npm run build
• npm test
• npm run lint
• git diff --check
• parser sanity check for .vcf .vcard and numbered ComicBook extension formats

IANA reference: https://www.iana.org/assignments/media-types/text/vcard