feat : 자재관리, 수입관리, 로트관리 모델링 추가

app/Models/MaterialReceipt.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class MaterialReceipt extends Model
+{
+    use SoftDeletes;
+
+    protected $fillable = [
+        'material_id', 'receipt_date', 'lot_number', 'received_qty', 'unit',
+        'supplier_name', 'manufacturer_name', 'purchase_price_excl_vat',
+        'weight_kg', 'status_code', 'is_inspection', 'inspection_date', 'remarks'
+    ];
+
+    // 자재 마스터
+    public function material()
+    {
+        return $this->belongsTo(Material::class, 'material_id');
+    }
+
+    // 수입검사 내역
+    public function inspections()
+    {
+        return $this->hasMany(MaterialInspection::class, 'receipt_id');
+    }
+}