Filters sites by server/powered_by/generator (e.g. "Shopify",
"WordPress", "nginx"), combinable with the existing keyword/TLD
filters. Results table now also shows each site's detected platform.
Verified: platform=Wix correctly isolates the one known Wix site,
tld=es+platform=nginx narrows to the 12 real nginx-hosted .es sites,
and the no-match case renders the empty state correctly.
The actual "who sells honey with a .es domain" feature: search sites
by keyword — matched against page title/description/keywords/body
text via a new MySQL fulltext index on site_pages — combined with an
optional TLD filter on the domain. Results are sites ranked by number
of matching pages. Shows nothing until a filter is entered, so it
doesn't just duplicate the plain Sites browse page.
Verified against real .es data pulled in for the test (dominio ->
4 matching sites, correctly ranked and TLD-filtered).
m105