feat: send WhatsApp low stock alert to store managers

app/Notifications/Inventory/LowStockAlertNotification.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Notifications\Inventory;
+
+use App\Models\Item;
+use App\Models\StockLevel;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Notification;
+use PromoSeven\UltraMessage\UltraMessageChannel;
+use PromoSeven\UltraMessage\UltraMessageMessage;
+
+class LowStockAlertNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public function __construct(private Item $item, private StockLevel $stockLevel) {}
+
+    public function via(mixed $notifiable): array
+    {
+        return [UltraMessageChannel::class];
+    }
+
+    public function toUltraMessage(mixed $notifiable): UltraMessageMessage
+    {
+        return UltraMessageMessage::text(
+            "⚠️ *Low Stock Alert*\n\nItem: *{$this->item->item_name}* ({$this->item->item_code})\nCurrent Stock: {$this->stockLevel->quantity} {$this->item->unit_of_measure}\nReorder Level: {$this->item->minimum_stock_level} {$this->item->unit_of_measure}\n\nPlease raise a purchase request."
+        );
+    }
+}