feat: Phase 3.8 바로빌 세금계산서 연동 API 구현

- 마이그레이션: barobill_settings, tax_invoices 테이블 생성
- 모델: BarobillSetting (인증서 암호화), TaxInvoice (상태/유형 상수)
- 서비스: BarobillService (API 연동), TaxInvoiceService (CRUD, 발행/취소)
- 컨트롤러: BarobillSettingController, TaxInvoiceController
- FormRequest: 6개 요청 검증 클래스
- Swagger: API 문서 완성 (BarobillSettingApi, TaxInvoiceApi)

app/Http/Requests/BarobillSetting/SaveBarobillSettingRequest.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Http\Requests\BarobillSetting;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class SaveBarobillSettingRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'corp_num' => ['required', 'string', 'size:10'],
+            'cert_key' => ['nullable', 'string', 'max:500'],
+            'barobill_id' => ['nullable', 'string', 'max:100'],
+            'corp_name' => ['required', 'string', 'max:100'],
+            'ceo_name' => ['required', 'string', 'max:50'],
+            'addr' => ['nullable', 'string', 'max:200'],
+            'biz_type' => ['nullable', 'string', 'max:100'],
+            'biz_class' => ['nullable', 'string', 'max:100'],
+            'contact_id' => ['nullable', 'string', 'email', 'max:100'],
+            'contact_name' => ['nullable', 'string', 'max:50'],
+            'contact_tel' => ['nullable', 'string', 'max:20'],
+            'is_active' => ['boolean'],
+            'auto_issue' => ['boolean'],
+        ];
+    }
+
+    public function attributes(): array
+    {
+        return [
+            'corp_num' => __('validation.attributes.corp_num'),
+            'cert_key' => __('validation.attributes.cert_key'),
+            'barobill_id' => __('validation.attributes.barobill_id'),
+            'corp_name' => __('validation.attributes.corp_name'),
+            'ceo_name' => __('validation.attributes.ceo_name'),
+            'addr' => __('validation.attributes.addr'),
+            'biz_type' => __('validation.attributes.biz_type'),
+            'biz_class' => __('validation.attributes.biz_class'),
+            'contact_id' => __('validation.attributes.contact_id'),
+            'contact_name' => __('validation.attributes.contact_name'),
+            'contact_tel' => __('validation.attributes.contact_tel'),
+        ];
+    }
+}