fix: register IssueResource at boot, gate visibility for admins only Route [filament.admin.resources.issues.index] was undefined because registerResources() was called inside Filament::serving() — too late for route compilation. Register unconditionally at boot and restrict via shouldRegisterNavigation/canViewAny on the resource. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>