Commits the musl-static backend binary and frontend tarball under
releases/v1.4.0/ so the raw-content URLs referenced by manifest.json
actually resolve. Without this commit update.check returns "available"
but update.download 404s, which is why self-updates have been silently
broken since 1.3.5.
Size budget note: this is ~110 MiB committed per release (binary + PWA
assets). Established pattern in the existing manifest; once CI publishes
reliably we can move to a GitHub release or FileBrowser share instead.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
df0736e2e0