Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/pkg/model/ownerbound.go

@@ -0,0 +1,21 @@
+package model
+
+import (
+	"git.sendico.io/tech/sxchnge/bff/pkg/db/storable"
+	"go.mongodb.org/mongo-driver/v2/bson"
+)
+
+// OwnerBound is implemented by resources that follow the personal-vs-org
+// ownership model (ownerKind + ownerRef). It is the type constraint for
+// ScopedDB and the canonical contract for scoped-access resources.
+//
+// permissionRef is deliberately absent: it is only meaningful for org-owned
+// resources and is supplied separately (as OrgPolicyRef) to the enforcement
+// layer. Mixing it here would re-introduce the very coupling this interface
+// is meant to eliminate.
+type OwnerBound interface {
+	storable.Storable
+	OrganizationBound
+	GetOwnerKind() OwnerKind
+	GetOwnerRef() bson.ObjectID
+}