v1.1.0 — Secure API-key storage + auto-updater

• Security: API keys are no longer rendered into the settings form (no page-source leak); a saved key shows only a masked hint, blank-to-keep.
• Security: Optional wp-config.php constant CBASIX_AUTOLINKS_CLAUDE_API_KEY keeps the key out of the database entirely.
• New: GitHub-based auto-updater so future versions distribute to all sites automatically.