feat: 푸터 사업자 정보 갱신 및 회사 정보 상수 분리

- 푸터 상호/CEO/사업자번호/주소/이메일을 신규 정보로 교체, 저작권 문구 추가
- 회사 정보를 shared/constants/company.ts로 분리해 푸터와 JSON-LD에서 공통 사용
- 메인 페이지 Organization 구조화 데이터의 이메일·주소 갱신

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/pages/index.vue

@@ -5,6 +5,7 @@
 import imgUsa from '~/assets/images/img-usa.svg'
 import imgHongkong from '~/assets/images/img-hongkong.svg'
 import imgBrand from '~/assets/images/img-brand.svg'
+import { COMPANY } from '~/shared/constants/company'
 
 const config = useRuntimeConfig()
 const siteUrl = String(config.public.siteUrl || '').replace(/\/$/, '')
@@ -26,18 +27,20 @@ useHead({
       innerHTML: JSON.stringify({
         '@context': 'https://schema.org',
         '@type': 'Organization',
-        name: '이너탭',
-        alternateName: 'innertab',
+        name: COMPANY.brandName,
+        legalName: COMPANY.legalName,
+        alternateName: ['innertab', COMPANY.legalNameEn],
         url: siteUrl,
         logo: `${siteUrl}/images/img-itab.png`,
-        email: 'innertab@gmail.com',
+        email: COMPANY.email,
         foundingDate: '2023',
         address: {
           '@type': 'PostalAddress',
-          addressCountry: 'KR',
-          addressRegion: '서울특별시',
-          addressLocality: '강남구',
-          streetAddress: '삼성동 121-38, 304호',
+          addressCountry: COMPANY.address.country,
+          addressRegion: COMPANY.address.region,
+          addressLocality: COMPANY.address.locality,
+          streetAddress: COMPANY.address.street,
+          postalCode: COMPANY.address.postalCode,
         },
         sameAs: ['https://selite.kr', 'https://retriq.co.kr'],
       }),