feat: [business-card] 명함신청 테이블 마이그레이션 추가

- business_card_requests 테이블 생성
- 신청자 정보 (name, phone, title, email, quantity, memo)
- 처리 상태 관리 (status, processed_by, processed_at, process_memo)

database/migrations/2026_02_24_100000_create_business_card_requests_table.php

@@ -0,0 +1,42 @@
+<?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::create('business_card_requests', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id')->comment('테넌트 ID');
+            $table->unsignedBigInteger('user_id')->comment('신청자 ID');
+
+            // 명함 정보
+            $table->string('name', 50)->comment('성함');
+            $table->string('phone', 20)->comment('전화번호');
+            $table->string('title', 50)->nullable()->comment('직함');
+            $table->string('email', 100)->nullable()->comment('이메일');
+            $table->unsignedInteger('quantity')->default(100)->comment('수량');
+            $table->text('memo')->nullable()->comment('비고');
+
+            // 처리 상태
+            $table->string('status', 20)->default('pending')->comment('상태: pending, processed');
+            $table->unsignedBigInteger('processed_by')->nullable()->comment('처리자 ID');
+            $table->timestamp('processed_at')->nullable()->comment('처리일시');
+            $table->text('process_memo')->nullable()->comment('처리 메모');
+
+            $table->timestamps();
+
+            // 인덱스
+            $table->index(['tenant_id', 'status']);
+            $table->index('user_id');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('business_card_requests');
+    }
+};