fix(diffusers): forward original config for single files

Assisted-by: Codex:gpt-5
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

backend/python/diffusers/test_load_options.py

@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: MIT
+
+import unittest
+
+from backend.python.diffusers.load_options import single_file_load_kwargs
+
+
+class SingleFileLoadKwargsTest(unittest.TestCase):
+    def test_includes_original_config_for_single_file(self):
+        self.assertEqual(
+            single_file_load_kwargs("configs/v1-inference.yaml", True),
+            {"original_config_file": "configs/v1-inference.yaml"},
+        )
+
+    def test_omits_original_config_for_pretrained_model(self):
+        self.assertEqual(
+            single_file_load_kwargs("configs/v1-inference.yaml", False),
+            {},
+        )
+
+    def test_omits_empty_original_config(self):
+        self.assertEqual(single_file_load_kwargs("", True), {})
+
+
+if __name__ == "__main__":
+    unittest.main()