feat(notification): 實作通知輪詢與優化顯示名稱

- 新增通知輪詢 API 與前端自動更新機制
- 修正生產工單單號格式為 PRO-YYYYMMDD-XX
- 確保通知顯示實際建立者名稱而非系統

app/Modules/Production/Observers/ProductionOrderObserver.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Modules\Production\Observers;
+
+use App\Modules\Production\Models\ProductionOrder;
+use App\Modules\Production\Notifications\NewProductionOrder;
+use App\Modules\Core\Models\User;
+use Illuminate\Support\Facades\Notification;
+
+class ProductionOrderObserver
+{
+    /**
+     * Handle the ProductionOrder "created" event.
+     */
+    public function created(ProductionOrder $productionOrder): void
+    {
+        // 找出有檢視生產工單權限的使用者
+        $users = User::permission('production_orders.view')->get();
+
+        $creatorName = $productionOrder->user ? $productionOrder->user->name : '系統';
+
+        if ($users->isNotEmpty()) {
+            Notification::send($users, new NewProductionOrder($productionOrder, $creatorName));
+        }
+    }
+}