Replace multi-page portal with hash-routed SPA, DFTE shell placeholders, and
data-first JSON APIs. Remove legacy routes, root-template override path, and
HTML-derived info pipeline. Add bootstrap feature flags, in-DOM toast/dialog UX,
OTA via POST /u, and tests for shell, bootstrap, API JSON, and captive host rule.
Rewrite README as fork disclaimer and modernization overview.
Split reusable HTML into Fragments, Message, and Param headers; route
more pages through DFTE streaming. Update handlers, WiFi polling JS,
and configuration/scanning tests; add template rendering coverage.
alex