major refactoring adding vendor and customer features

docs/api/index.md

@@ -46,10 +46,10 @@ All API endpoints are versioned using URL path versioning:
 - Shop-product associations
 - Shop statistics
 
-### Stock (`/stock/`)
+### Inventory (`/inventory/`)
 - Inventory management
-- Stock movements
-- Stock reporting
+- Inventory movements
+- Inventory reporting
 
 ### Marketplace (`/marketplace/`)
 - Import job management