feat(dashboard): fingerprint discovery page — extract and group JA4/H2/headers from traffic
- GET /api/fingerprint-discovery: queries http_logs, groups by JA4, aggregates
UA family, header presence rates (Sec-CH-UA, Sec-Fetch, Accept-Language,
zstd, brotli, gzip, XFF), H2 data, TLS info, dict lookups
- /fingerprints page: KPIs, doughnut chart by family, stacked header bars,
filterable/sortable profile table, expandable detail panel
- Promote button: push H2 fingerprints to browser_h2_signatures via existing
POST /api/browser-signatures/entries endpoint
- Nav link: Découverte added after Navigateurs in sidebar
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
fb73c60e7d