[enricher] metadata.json aggiornato con fonti e domini

faiss_index/metadata.json

@@ -6,10 +6,12 @@
   "index_type": "IVF_FLAT",
   "ivf_nlist": 256,
   "domains": {
-    "": 839422
+    "": 303555,
+    "normattiva_multivigente": 535867
   },
   "sources": {
-    "": 839422
+    "": 303555,
+    "normattiva": 535867
   },
   "samples": [
     {
@@ -93,14 +95,14 @@
       "year": null
     }
   ],
-  "enrichment_timestamp": "2026-04-22T22:04:10.884485+00:00",
+  "enrichment_timestamp": "2026-04-22T22:20:16.618006+00:00",
   "corrupted_count": 0,
   "corrupted_sample_count": 0,
   "corrupted_truncated": false,
   "enrichment_stats": {
-    "matched": 0,
-    "unmatched": 839422,
-    "urn_lookup_size": 245442,
+    "matched": 535867,
+    "unmatched": 303555,
+    "urn_lookup_size": 245439,
     "archive_stats": {
       "affariinterni": {
         "label": "Ministero dell'Interno",