fix: 修正部分進貨採購單更新失敗與狀態顯示問題

app/Modules/Inventory/Models/GoodsReceipt.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Modules\Inventory\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class GoodsReceipt extends Model
+{
+    use HasFactory, SoftDeletes;
+    use \Spatie\Activitylog\Traits\LogsActivity;
+
+    protected $fillable = [
+        'code',
+        'type',
+        'warehouse_id',
+        'purchase_order_id',
+        'vendor_id',
+        'received_date',
+        'status',
+        'remarks',
+        'user_id',
+    ];
+
+    protected $casts = [
+        'received_date' => 'date',
+    ];
+
+    public function getActivitylogOptions(): \Spatie\Activitylog\LogOptions
+    {
+        return \Spatie\Activitylog\LogOptions::defaults()
+            ->logAll()
+            ->logOnlyDirty()
+            ->dontSubmitEmptyLogs();
+    }
+
+    public function items()
+    {
+        return $this->hasMany(GoodsReceiptItem::class);
+    }
+    
+    // Strict Mode: relationships to Warehouse is allowed (same module).
+    public function warehouse()
+    {
+        return $this->belongsTo(Warehouse::class);
+    }
+    
+    // Strict Mode: cross-module relationship to Vendor/User/PurchaseOrder is restricted.
+    // They are accessed via IDs or Services.
+}