fix:사업자번호 자동 하이픈 포맷팅 추가

- 입력 시 자동으로 000-00-00000 형식 적용
- 숫자만 입력해도 자동 변환
- 중복확인 시 형식 검증 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

resources/views/sales/prospects/create.blade.php

@@ -32,7 +32,7 @@
             <label class="block text-sm font-medium text-gray-700 mb-2">사업자번호 <span class="text-red-500">*</span></label>
             <div class="flex gap-2">
                 <input type="text" name="business_number" id="business_number" value="{{ old('business_number') }}" required
-                       placeholder="000-00-00000"
+                       placeholder="000-00-00000" maxlength="12"
                        class="flex-1 px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500 @error('business_number') border-red-500 @enderror">
                 <button type="button" id="checkBusinessNumber"
                         class="px-4 py-2 bg-gray-600 hover:bg-gray-700 text-white rounded-lg transition">
@@ -120,6 +120,25 @@ class="px-6 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition"
 
 @push('scripts')
 <script>
+// 사업자번호 자동 포맷팅 (000-00-00000)
+document.getElementById('business_number').addEventListener('input', function(e) {
+    let value = e.target.value.replace(/[^0-9]/g, ''); // 숫자만 추출
+
+    if (value.length > 10) {
+        value = value.substring(0, 10); // 최대 10자리
+    }
+
+    // 하이픈 삽입 (3-2-5 형식)
+    if (value.length > 5) {
+        value = value.substring(0, 3) + '-' + value.substring(3, 5) + '-' + value.substring(5);
+    } else if (value.length > 3) {
+        value = value.substring(0, 3) + '-' + value.substring(3);
+    }
+
+    e.target.value = value;
+});
+
+// 중복 확인
 document.getElementById('checkBusinessNumber').addEventListener('click', function() {
     const businessNumber = document.getElementById('business_number').value;
     const resultEl = document.getElementById('businessNumberResult');
@@ -130,6 +149,13 @@ class="px-6 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition"
         return;
     }
 
+    // 형식 검증 (000-00-00000)
+    if (!/^\d{3}-\d{2}-\d{5}$/.test(businessNumber)) {
+        resultEl.textContent = '사업자번호 형식이 올바르지 않습니다. (000-00-00000)';
+        resultEl.className = 'mt-1 text-sm text-red-500';
+        return;
+    }
+
     fetch('{{ route("sales.prospects.check-business-number") }}', {
         method: 'POST',
         headers: {