fix: precios PZ se importan sin IVA (dividiendo entre 1.16)

scripts/migrate_pz_to_tenant.py

@@ -146,9 +146,14 @@ def migrate_inventory(mysql, pg):
             continue
 
         cost = float(r[3] or 0)
-        price_1 = float(r[4] or 0)
-        price_2 = float(r[5] or 0)
-        price_3 = float(r[6] or 0)
+        # El respaldo PZ guarda precios con IVA incluido; Nexus los maneja sin IVA
+        # y aplica el tax_rate al momento de la venta.
+        def excl_iva(val):
+            v = float(val or 0)
+            return round(v / 1.16, 2) if v > 0 else 0
+        price_1 = excl_iva(r[4])
+        price_2 = excl_iva(r[5])
+        price_3 = excl_iva(r[6])
         iva = r[7]
         tax_rate = float(iva) / 100.0 if iva else 0.16
         brand = brand_map.get(r[8]) or None