fix(apps): scope forte-drop to upc-dev only, not via base

forte-drop and forte-drop-mcp have hackathon-domain values hardcoded
(drop-k8s.hackathon.forteapps.net). Listing them in apps/base/
syncs them to both upc-dev and upc-prod overlays — prod sync would
create broken Applications pointing at non-existent prod ingress.

Move references to apps/overlays/upc-dev/ only.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/base/kustomization.yaml

@@ -6,5 +6,3 @@ resources:
 - musicman
 - ts-mcp
 - argo-mcp
-- forte-drop
-- forte-drop-mcp