링크결제 신청 단계 폼 다국어 지원 추가

- Step1, Step2 폼 레이블 현지화
- 발송 수단, 상품 정보, 구매자 정보 등 모든 필드 번역
- 구매자 정보 대조 옵션(개인/법인) 다국어 적용
- 언어 선택(국문/영문), 링크내용(기본/추가) 현지화

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/locales/en.json

@@ -1071,7 +1071,25 @@
             "linkBreakFailed": "Failed to break link. Please check individual status.",
             "linkBreakFailedGeneric": "Failed to break link.",
             "pleaseRetry": "Please try again",
-            "resendSuccess": "Resend successful.",
+            "sendMethod": "Send Method",
+            "productPrice": "Product Price",
+            "productOrderNumber": "Product Order Number",
+            "paymentValidDate": "Payment Valid Date",
+            "until": "Until",
+            "selectDate": "Select Date",
+            "buyerEmail": "Buyer Email",
+            "buyerPhoneNumber": "Buyer\nPhone Number",
+            "buyerInfoVerification": "Buyer Info Verification",
+            "individual": "Individual",
+            "corporate": "Corporate",
+            "businessNumber10Digits": "Business Number (10 digits)",
+            "birthDate6Digits": "Birth Date (6 digits)",
+            "language": "Language",
+            "korean": "Korean",
+            "english": "English",
+            "linkContent": "Link Content",
+            "basic": "Basic",
+            "additional": "Additional",
             "resendFailed": "Resend failed.",
             "resendError": "An error occurred during resend.",
             "resendConfirm": "Do you want to resend?",