Update backend with high-quality catalog and fixes

app/api/admin.py

@@ -477,7 +477,7 @@ def get_quality_summary(
     
     total_products = db.query(func.count(Product.id)).scalar()
     deleted_products = db.query(func.count(Product.id)).filter(Product.deleted_at.isnot(None)).scalar()
-    active_products = db.query(func.count(Product.id)).filter(Product.deleted_at.is_ (None)).scalar()
+    active_products = db.query(func.count(Product.id)).filter(Product.deleted_at.is_(None)).scalar()
     
     # Average quality score of active products
     avg_score_val = db.query(func.avg(Product.quality_score)).filter(Product.deleted_at.is_(None)).scalar()