feat(footer): 푸터 로고 logo_bottom.png 교체

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/layout/Footer.jsx

@@ -48,9 +48,8 @@ export default function Footer() {
           {/* 회사 정보 */}
           <div className="footer-brand">
             <Link to="/" className="footer-logo">
-              <img src="/zioinfo-logo.png" alt="(주)지오정보기술 로고" height="36"
-                   style={{ filter: 'brightness(0) invert(1)' }}
-                   onError={e => { e.target.src='/ziologo.png'; e.target.onerror = () => { e.target.style.display='none'; e.target.nextSibling.style.display='block'; }; }} />
+              <img src="/logo_bottom.png" alt="(주)지오정보기술 로고" height="36"
+                   onError={e => { e.target.style.display='none'; e.target.nextSibling.style.display='block'; }} />
               <span className="footer-logo-text" style={{display:'none'}}>
                 <strong>Zio</strong>Info
               </span>