ADD: Warehouse inventory management system

- Add WarehouseItem model with bilingual names (FA/EN) and bilingual counting units
- Add WarehouseItemTransaction model for IN/OUT movements with reason and actor
- Add WarehouseItemStock model for denormalized per-(item×warehouse) running balance
- Add warehouseItemService with full CRUD, atomic stock updates via $inc, negative stock guard, and aggregation queries for per-item/per-warehouse/total stock
- Add warehouseItemController and REST routes at /api/warehouse-items
- Add warehouseService, warehouseController, warehouseRoutes for warehouse location CRUD at /api/warehouses
- Register both route groups in routerEndpoints.js

components/warehouse/warehouseRoutes.js

@@ -0,0 +1,15 @@
+const express = require('express')
+const warehouseController = require('./warehouseController')
+const loginCheck = require('../../middlewares/loginCheck')
+
+const router = new express.Router()
+
+router.use(loginCheck.loginProtect)
+
+router.get('/admin/get-all', warehouseController.listWarehouses)
+router.post('/admin/create', warehouseController.createWarehouse)
+router.get('/admin/get-one/:warehouseId', warehouseController.getWarehouse)
+router.patch('/admin/update/:warehouseId', warehouseController.updateWarehouse)
+router.delete('/admin/delete/:warehouseId', warehouseController.deleteWarehouse)
+
+module.exports = router