feat(api): 배송방식 공통코드 추가

- delivery_method 코드 그룹 추가
- direct: 상차, pickup: 택배

Co-Authored-By: Claude <noreply@anthropic.com>

database/migrations/2026_01_23_100000_add_delivery_method_codes_to_common_codes.php

@@ -0,0 +1,44 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $now = now();
+
+        // delivery_method 코드 그룹 (배송방식)
+        $deliveryMethods = [
+            ['code' => 'direct', 'name' => '상차', 'sort_order' => 1],
+            ['code' => 'pickup', 'name' => '택배', 'sort_order' => 2],
+        ];
+
+        foreach ($deliveryMethods as $item) {
+            DB::table('common_codes')->updateOrInsert(
+                ['code_group' => 'delivery_method', 'code' => $item['code']],
+                [
+                    'code_group' => 'delivery_method',
+                    'code' => $item['code'],
+                    'name' => $item['name'],
+                    'sort_order' => $item['sort_order'],
+                    'is_active' => true,
+                    'created_at' => $now,
+                    'updated_at' => $now,
+                ]
+            );
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        DB::table('common_codes')->where('code_group', 'delivery_method')->delete();
+    }
+};