feat(workflow): diploma-eligibility DMN + CBGV-advies routing (S-13, refs #14)

Add workflows/diploma-eligibility.dmn (origin → route) and wire the registratie
BPMN: a businessRuleTask evaluates it inline and an exclusive gateway routes a
foreign diploma through a new CBGVAdvies user task before Beoordelen, a domestic
one straight there (ADR-0016). Deploy the DMN to Flowable's DMN engine and stage
both workflow files into the fl-bpmn volume.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

infra/seed-config.sh

@@ -40,7 +40,7 @@ for key in "$@"; do
     oz) populate rr-oz-config "$here/openzaak/setup_configuration/." ;;
     nrc) populate rr-nrc-config "$here/opennotificaties/setup_configuration/." ;;
     kc) populate rr-kc-realms "$here/keycloak/realms/." ;;
-    fl) populate rr-fl-bpmn  "$here/../workflows/registratie.bpmn" ;;
+    fl) populate rr-fl-bpmn  "$here/../workflows/." ;;  # registratie.bpmn + diploma-eligibility.dmn
     *)  echo "unknown seed key: $key" >&2; exit 2 ;;
   esac
 done