feat: [barobill] 바로빌 연동 관리 API 7개 엔드포인트 구현

- SOAP 기반 BarobillSoapService 생성 (MNG 코드 포팅)
- BarobillMember, BarobillConfig 모델 생성
- BarobillController 7개 메서드 (login, signup, status, URL 조회)
- FormRequest 검증 클래스 3개 생성
- 라우트 등록 (POST /barobill/login, /signup, GET /status 등)
- i18n 메시지 키 추가 (ko/en)
- config/services.php에 barobill 설정 추가

app/Http/Controllers/Api/V1/BarobillController.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Helpers\ApiResponse;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Barobill\BankServiceUrlRequest;
+use App\Http\Requests\Barobill\BarobillLoginRequest;
+use App\Http\Requests\Barobill\BarobillSignupRequest;
+use App\Services\Barobill\BarobillSoapService;
+
+class BarobillController extends Controller
+{
+    public function __construct(
+        private BarobillSoapService $barobillSoapService
+    ) {}
+
+    public function login(BarobillLoginRequest $request)
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->registerLogin($request->validated()),
+            __('message.barobill.login_success')
+        );
+    }
+
+    public function signup(BarobillSignupRequest $request)
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->registerSignup($request->validated()),
+            __('message.barobill.signup_success')
+        );
+    }
+
+    public function bankServiceUrl(BankServiceUrlRequest $request)
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->getBankServiceRedirectUrl($request->validated()),
+            __('message.fetched')
+        );
+    }
+
+    public function status()
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->getIntegrationStatus(),
+            __('message.fetched')
+        );
+    }
+
+    public function accountLinkUrl()
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->getAccountLinkRedirectUrl(),
+            __('message.fetched')
+        );
+    }
+
+    public function cardLinkUrl()
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->getCardLinkRedirectUrl(),
+            __('message.fetched')
+        );
+    }
+
+    public function certificateUrl()
+    {
+        return ApiResponse::handle(
+            fn () => $this->barobillSoapService->getCertificateRedirectUrl(),
+            __('message.fetched')
+        );
+    }
+}