v1.12.0 — app preview videos + auto-snapshot safety net

Published via CI with provenance.

Added

• App preview videos — list/get/create-set/upload/delete, plus backup (snapshot_app_metadata includePreviews:true) and restore_app_previews.
• Auto-snapshot — APPSTORE_MCP_AUTO_SNAPSHOT=true snapshots text metadata before the first listing edit of a session, so "revert" works even without a manual snapshot.

80 tools. Validated: auto-snapshot fires before writes; preview endpoints + tests green.