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/Models/ProductionOrder.php

@@ -112,13 +112,17 @@ class ProductionOrder extends Model
 
     public static function generateCode()
     {
-        $prefix = 'PO' . now()->format('Ymd');
-        $lastOrder = self::where('code', 'like', $prefix . '%')->latest()->first();
+        $prefix = 'PRO-' . now()->format('Ymd') . '-';
+        $lastOrder = self::where('code', 'like', $prefix . '%')
+            ->lockForUpdate()
+            ->orderBy('code', 'desc')
+            ->first();
+
         if ($lastOrder) {
-            $lastSequence = intval(substr($lastOrder->code, -3));
-            $sequence = str_pad($lastSequence + 1, 3, '0', STR_PAD_LEFT);
+            $lastSequence = intval(substr($lastOrder->code, -2));
+            $sequence = str_pad($lastSequence + 1, 2, '0', STR_PAD_LEFT);
         } else {
-            $sequence = '001';
+            $sequence = '01';
         }
         return $prefix . $sequence;
     }
@@ -127,4 +131,9 @@ class ProductionOrder extends Model
     {
         return $this->hasMany(ProductionOrderItem::class);
     }
+
+    public function user(): \Illuminate\Database\Eloquent\Relations\BelongsTo
+    {
+        return $this->belongsTo(\App\Modules\Core\Models\User::class);
+    }
 }