feat: [business-card] ordered_by, ordered_at 컬럼 추가

- 3단계 워크플로우: 요청 → 제작의뢰 → 처리완료

database/migrations/2026_02_25_100000_add_ordered_columns_to_business_card_requests_table.php

@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('business_card_requests', function (Blueprint $table) {
+            $table->unsignedBigInteger('ordered_by')->nullable()->after('status')->comment('제작의뢰 처리자 ID');
+            $table->timestamp('ordered_at')->nullable()->after('ordered_by')->comment('제작의뢰 일시');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('business_card_requests', function (Blueprint $table) {
+            $table->dropColumn(['ordered_by', 'ordered_at']);
+        });
+    }
+};