* feat: block self-stack lifecycle ops with UI and preflight guardrails
Refuse update, deploy, down, stop, and delete when the stack matches Sencho's compose project.
Return 409 self_stack_protected. Expose isSelf on /statuses and disable guarded UI actions.
Add SelfStackProtectedDialog and self-managed-stack preflight warning.
Closes#1564
* fix: add missing stackSelfFlags mock to useSidebarContextMenu test
The production hook now reads stackListState.stackSelfFlags[file], but the
test mock did not include it, causing 6 tests to fail with TypeError:
Cannot read properties of undefined (reading 'web.yml').
* fix: harden self-stack protection during startup
Add a global environment preflight warning when Sencho is managed inside COMPOSE_DIR.
Align status decoration and route guards on Docker label fallback detection.
Block rollback and service-level stop on the protected self stack.
* fix: add self_stack_location to diagnostics-route expected check IDs
Anso