Kaede Akino
996ea85196
Derive groupScopedV2 host UUIDs from the group, MagicDNS suffix and stable node ID. Remove experimental identity compatibility and Tailnet conflict handling, and hide unavailable Metrics hosts while retaining configuration. Keep saved enrollments active until Save. Retire unsaved login candidates on Logout or Discard, including repeated replacement logins, while preserving the original enrollment. Use the same behavior in New and Edit forms. Validation: 94 focused tests, iOS Simulator build, Swift formatting and AppStrings/Chinese localization checks passed. The default suite still has 9 failures in untouched notification, agent and key export tests. BREAKING CHANGE: Tailscale only accepts groupScopedV2 identities. Remove old Tailscale test data before using this build; no ID migration is provided.