feat: [tax-invoice] 바로빌 SOAP 연동 및 공급자 설정 API 추가

- BarobillService HTTP→SOAP 전환 (MNG EtaxController 포팅)
- TI SOAP 클라이언트, callSoap(), buildTaxInvoiceData MNG 형식 적용
- issueTaxInvoice/cancelTaxInvoice/checkNtsSendStatus SOAP 방식
- 공급자 설정 조회/저장 API (GET/PUT /supplier-settings)
- 생성+즉시발행 통합 API (POST /issue-direct)
- SaveSupplierSettingsRequest FormRequest 추가

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

@@ -6,6 +6,7 @@
 use App\Http\Controllers\Controller;
 use App\Http\Requests\TaxInvoice\CancelTaxInvoiceRequest;
 use App\Http\Requests\TaxInvoice\CreateTaxInvoiceRequest;
+use App\Http\Requests\TaxInvoice\SaveSupplierSettingsRequest;
 use App\Http\Requests\TaxInvoice\TaxInvoiceListRequest;
 use App\Http\Requests\TaxInvoice\TaxInvoiceSummaryRequest;
 use App\Http\Requests\TaxInvoice\UpdateTaxInvoiceRequest;
@@ -148,4 +149,44 @@ public function summary(TaxInvoiceSummaryRequest $request)
             message: __('message.fetched')
         );
     }
+
+    /**
+     * 공급자 설정 조회
+     */
+    public function supplierSettings()
+    {
+        $settings = $this->taxInvoiceService->getSupplierSettings();
+
+        return ApiResponse::handle(
+            data: $settings,
+            message: __('message.fetched')
+        );
+    }
+
+    /**
+     * 공급자 설정 저장
+     */
+    public function saveSupplierSettings(SaveSupplierSettingsRequest $request)
+    {
+        $settings = $this->taxInvoiceService->saveSupplierSettings($request->validated());
+
+        return ApiResponse::handle(
+            data: $settings,
+            message: __('message.updated')
+        );
+    }
+
+    /**
+     * 세금계산서 생성 + 즉시 발행
+     */
+    public function storeAndIssue(CreateTaxInvoiceRequest $request)
+    {
+        $taxInvoice = $this->taxInvoiceService->createAndIssue($request->validated());
+
+        return ApiResponse::handle(
+            data: $taxInvoice,
+            message: __('message.tax_invoice.issued'),
+            status: 201
+        );
+    }
 }