fix(dashboard): cache ROA price status and align nefacturate counts

- Add price_match column to SQLite, cached on order detail view
- Background backfill on startup checks all unchecked imported orders
- Extract _enrich_items_with_codmat() helper to deduplicate SKU enrichment
- Attention card now shows same nefacturate count as filter pill

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/database.py

@@ -332,6 +332,7 @@ def init_sqlite():
             ("discount_total", "REAL"),
             ("web_status", "TEXT"),
             ("discount_split", "TEXT"),
+            ("price_match", "INTEGER"),
         ]:
             if col not in order_cols:
                 conn.execute(f"ALTER TABLE orders ADD COLUMN {col} {typedef}")