feat: [tax-invoice] 공급자 설정 Tenant Fallback 로직 추가

- BarobillSetting 미설정 시 Tenant 정보를 기본값으로 반환
- corp_num/corp_name이 비어있으면 Fallback 동작
- Tenant 필드 매핑: business_num, company_name, ceo_name, address, phone
- Tenant options 매핑: business_type, business_category, tax_invoice_contact, tax_invoice_email

app/Services/TaxInvoiceService.php

@@ -3,6 +3,7 @@
 namespace App\Services;
 
 use App\Models\Tenants\TaxInvoice;
+use App\Models\Tenants\Tenant;
 use Illuminate\Contracts\Pagination\LengthAwarePaginator;
 use Illuminate\Support\Facades\DB;
 
@@ -276,26 +277,61 @@ public function checkStatus(int $id): TaxInvoice
     // =========================================================================
 
     /**
-     * 공급자 설정 조회 (BarobillSetting 기반)
+     * 공급자 설정 조회 (BarobillSetting 기반, 미설정 시 Tenant 정보 Fallback)
      */
     public function getSupplierSettings(): array
     {
         $setting = $this->barobillService->getSetting();
 
-        if (! $setting) {
+        if ($setting && $this->hasSupplierData($setting)) {
+            return [
+                'business_number' => $setting->corp_num,
+                'company_name' => $setting->corp_name,
+                'representative_name' => $setting->ceo_name,
+                'address' => $setting->addr,
+                'business_type' => $setting->biz_type,
+                'business_item' => $setting->biz_class,
+                'contact_name' => $setting->contact_name,
+                'contact_phone' => $setting->contact_tel,
+                'contact_email' => $setting->contact_id,
+            ];
+        }
+
+        // BarobillSetting 미설정 시 Tenant 정보를 기본값으로 반환
+        return $this->getSupplierSettingsFromTenant();
+    }
+
+    /**
+     * BarobillSetting에 공급자 정보가 입력되어 있는지 확인
+     */
+    private function hasSupplierData($setting): bool
+    {
+        return ! empty($setting->corp_num) || ! empty($setting->corp_name);
+    }
+
+    /**
+     * Tenant 정보에서 공급자 설정 기본값 조회
+     */
+    private function getSupplierSettingsFromTenant(): array
+    {
+        $tenant = Tenant::find($this->tenantId());
+
+        if (! $tenant) {
             return [];
         }
 
+        $options = $tenant->options ?? [];
+
         return [
-            'business_number' => $setting->corp_num,
+            'business_number' => $tenant->business_num ?? '',
-            'company_name' => $setting->corp_name,
+            'company_name' => $tenant->company_name ?? '',
-            'representative_name' => $setting->ceo_name,
+            'representative_name' => $tenant->ceo_name ?? '',
-            'address' => $setting->addr,
+            'address' => $tenant->address ?? '',
-            'business_type' => $setting->biz_type,
+            'business_type' => $options['business_type'] ?? '',
-            'business_item' => $setting->biz_class,
+            'business_item' => $options['business_category'] ?? '',
-            'contact_name' => $setting->contact_name,
+            'contact_name' => $options['tax_invoice_contact'] ?? '',
-            'contact_phone' => $setting->contact_tel,
+            'contact_phone' => $tenant->phone ?? '',
-            'contact_email' => $setting->contact_id,
+            'contact_email' => $options['tax_invoice_email'] ?? '',
         ];
     }