Migrate Nginx importer to advisory V2#2109

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ziadhany wants to merge 3 commits intoaboutcode-org:mainfrom

ziadhany:nginx-migration

Commits on Jan 6, 2026

Initial migration of nginx importer
ziadhany
committed

Commits on Jan 9, 2026

Update nginx to store patch data and ensure fixed_version_range is correctly assigned.
ziadhany
committed
Remove unused test file security_advisories-importer-expected.json
ziadhany
committed