The esp-web-tools manifest carried a frozen version:beta_1 while the rolling
/latest/ bins moved on, so the web flasher always said beta_1. Fix:
- scripts/build/gen-flasher-meta.py emits version.json (tag + notes) + per-release
manifests (version=tag) into /latest/; release.sh + the CI workflow run it, so
the metadata rolls with every release.
- the site points the install buttons at the VPS manifests and renders a live
'What's new in <tag>' block from version.json.
- drop the frozen static site manifests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
