fix: EU AI Act checklist reduced to 8 items with 2 pre-checked

Remove data_licensing entry from EU_AI_ACT_ITEMS to match Sprint 4
spec: exactly 8 checklist items, 2 auto-checked on load.

Author: BeratMert29

backend/app/services/ethics_service.py

@@ -79,14 +79,6 @@
         "article": "Art. 9",
         "pre_checked": False,
     },
-    {
-        "id": "data_licensing",
-        "text": "Dataset licensing verified — 18/20 datasets bundled under open licenses "
-                "(CC BY 4.0, CC0 1.0, CC BY-SA 4.0, CC BY-NC 4.0); "
-                "2 datasets with unclear licensing fetched at runtime for educational use only "
-                "(see DATA_LICENSES.md)",
-        "pre_checked": True,
-    },
 ]
 
 CASE_STUDIES = [