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/keycloak-client-forte-drop.yaml

@@ -0,0 +1,38 @@
+# Labeled config Secret read by the Keycloak Client Registrar. Kyverno clones it
+# to the keycloak namespace; a CronJob registers the OIDC client in the forte
+# realm and writes the credentials back as forte-drop-oidc-credentials in THIS
+# namespace (~2 min). The forte-helm auth sidecar (auth.type: oidc) consumes that
+# registrar-created Secret automatically — no manual SealedSecret step needed.
+apiVersion: v1
+kind: Secret
+metadata:
+  name: keycloak-client-forte-drop
+  namespace: forte-drop
+  labels:
+    keycloak.forteapps.net/client-config: "true"
+  annotations:
+    keycloak.forteapps.net/source-namespace: "forte-drop"
+stringData:
+  client.json: |
+    {
+      "clientId": "forte-drop",
+      "name": "Forte Drop (web)",
+      "enabled": true,
+      "protocol": "openid-connect",
+      "clientAuthenticatorType": "client-secret",
+      "standardFlowEnabled": true,
+      "directAccessGrantsEnabled": false,
+      "serviceAccountsEnabled": false,
+      "publicClient": false,
+      "redirectUris": ["https://drop-k8s.hackathon.forteapps.net/auth/callback"],
+      "webOrigins": ["https://drop-k8s.hackathon.forteapps.net"],
+      "defaultClientScopes": ["openid","email","profile"],
+      "secret": {
+        "namespace": "forte-drop",
+        "name": "forte-drop-oidc-credentials",
+        "keys": {
+          "clientId": "client-id",
+          "clientSecret": "client-secret"
+        }
+      }
+    }