Switches the Tauri updater endpoint from GitHub Releases to a static
host. New Ed25519 pubkey (old private key was lost); existing 0.10.x
installs need one manual reinstall to pick up the new updater identity.
Release flow is now pnpm release <version> <notes> which bumps,
builds + signs locally, scps artifacts to the server, commits, tags.
GitHub workflow stays as workflow_dispatch backup (Windows only).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>