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/warehouseController.js

@@ -0,0 +1,27 @@
+const catchAsync = require('../../globalErrorHandler/catchAsync')
+const warehouseService = require('./warehouseService')
+
+exports.createWarehouse = catchAsync(async (req, res, next) => {
+    const warehouse = await warehouseService.createWarehouse(req.body)
+    res.status(201).json({ status: 'success', data: warehouse })
+})
+
+exports.listWarehouses = catchAsync(async (req, res, next) => {
+    const warehouses = await warehouseService.listWarehouses(req.query)
+    res.status(200).json({ status: 'success', results: warehouses.length, data: warehouses })
+})
+
+exports.getWarehouse = catchAsync(async (req, res, next) => {
+    const warehouse = await warehouseService.getWarehouse(req.params.warehouseId)
+    res.status(200).json({ status: 'success', data: warehouse })
+})
+
+exports.updateWarehouse = catchAsync(async (req, res, next) => {
+    const warehouse = await warehouseService.updateWarehouse(req.params.warehouseId, req.body)
+    res.status(200).json({ status: 'success', data: warehouse })
+})
+
+exports.deleteWarehouse = catchAsync(async (req, res, next) => {
+    await warehouseService.deleteWarehouse(req.params.warehouseId)
+    res.status(200).json({ status: 'success', data: null })
+})