feat: Daum 우편번호 서비스 연동 및 악성채권 UI 개선

- useDaumPostcode 공통 훅 생성 (Daum Postcode API 연동)
- 우편번호 찾기 기능 적용: 악성채권, 거래처, 직원, 회사정보, 주문등록
- 악성채권 페이지 토글 순서 변경 (라벨 → 토글)
- 악성채권 토글 기능 수정 (매출/매입 → 등록/해제)

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

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

src/components/hr/EmployeeManagement/EmployeeForm.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { useState, useEffect } from 'react';
+import { useDaumPostcode } from '@/hooks/useDaumPostcode';
 import { useRouter } from 'next/navigation';
 import { PageLayout } from '@/components/organisms/PageLayout';
 import { PageHeader } from '@/components/organisms/PageHeader';
@@ -77,6 +78,20 @@ export function EmployeeForm({
   const router = useRouter();
   const [formData, setFormData] = useState<EmployeeFormData>(initialFormData);
 
+  // Daum 우편번호 서비스
+  const { openPostcode } = useDaumPostcode({
+    onComplete: (result) => {
+      setFormData(prev => ({
+        ...prev,
+        address: {
+          ...prev.address,
+          zipCode: result.zonecode,
+          address1: result.address,
+        },
+      }));
+    },
+  });
+
   // 항목 설정 상태
   const [showFieldSettings, setShowFieldSettings] = useState(false);
   const [fieldSettings, setFieldSettings] = useState<FieldSettings>(initialFieldSettings);
@@ -367,7 +382,7 @@ export function EmployeeForm({
                     <div className="space-y-2">
                       <Label>주소</Label>
                       <div className="flex gap-2">
-                        <Button type="button" variant="default" size="sm" className="bg-blue-500 hover:bg-blue-600">
+                        <Button type="button" variant="default" size="sm" onClick={openPostcode} className="bg-blue-500 hover:bg-blue-600">
                           우편번호 찾기
                         </Button>
                         <Input