fix: honor tenant validation during plugin imports

netbox_export/services/plugin_compat.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+
+def netbox_utilities_tenant_required() -> bool:
+    """Return the effective tenant policy without requiring the optional plugin."""
+    try:
+        from netbox_utilities.runtime import tenant_required
+    except ImportError:
+        return False
+    return bool(tenant_required())
+
+
+def relation_required_before_save(field, *, tenant_required: bool) -> bool:
+    if not tenant_required or field.name != "tenant":
+        return False
+    related_model = getattr(field.remote_field, "model", None)
+    return getattr(getattr(related_model, "_meta", None), "label_lower", None) == "tenancy.tenant"