refactor(apps): move forte-drop apps from base to upc-dev overlay

forte-drop, forte-drop-mcp and forte-drop-postgresql lived under apps/base/
but were only ever wired into the upc-dev overlay (never listed in
apps/base/kustomization.yaml). They carry hackathon-domain hardcoded values
and must not sync to upc-prod, so they belong in the overlay alongside
dbunk-demo — per danijel.simeunovic's review on PR #18.

- git mv the three dirs into apps/overlays/upc-dev/ (history preserved)
- rewrite overlay kustomization refs from ../../base/forte-drop* to local
- repoint forte-drop-postgresql Application path
  apps/base/... -> apps/overlays/upc-dev/forte-drop-postgresql/resources

Render-verified: kubectl kustomize apps/overlays/upc-dev differs only by the
postgres path line; apps/overlays/upc-prod render byte-identical (forte-drop
never reaches prod).

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

apps/overlays/upc-dev/forte-drop-postgresql/resources/forte-drop-pg-creds-sealed.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: bitnami.com/v1alpha1
+kind: SealedSecret
+metadata:
+  name: forte-drop-pg-creds
+  namespace: forte-drop
+spec:
+  encryptedData:
+    pgpassword: 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
+    pgusername: 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
+  template:
+    metadata:
+      name: forte-drop-pg-creds
+      namespace: forte-drop