feat(legal): add structured attribution fields and publish legal gate

backend/tests/test_admin_ui.py

@@ -95,6 +95,14 @@ class TestAdminUi(unittest.TestCase):
                 summary="Summary A",
                 content_raw="Volltext A",
                 content_rewritten=None,
+                image_urls_json='["https://example.org/img.jpg"]',
+                press_contact="Kontakt",
+                source_name_snapshot="Test Source",
+                source_terms_url_snapshot="https://example.org/terms",
+                source_license_name_snapshot="cc-by",
+                legal_checked=False,
+                legal_checked_at=None,
+                legal_note=None,
                 word_count=2,
                 status="new",
                 meta_json='{"extraction":{"images":["https://example.org/img.jpg"],"press_contact":"Kontakt"}}',