chore(spec): regen api-surface snapshot after IUIService removal

Acknowledges the intentional breaking removal in the api-surface ledger (major
changeset already present). Fixes the 'public API surface' check on #2374.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

packages/spec/api-surface.json

@@ -3498,7 +3498,6 @@
     "ITeamGraphService (interface)",
     "ITenantRouter (interface)",
     "ITypedEventEmitter (interface)",
-    "IUIService (interface)",
     "IWorkflowService (interface)",
     "ImportObjectOpts (interface)",
     "ImportObjectResult (interface)",