fix(color): eliminate redundant dark: accent modifiers (R-8.29), resolve A-1/A-2/A-9 contrast issues, and implement C11-9 quality gate

refer_landing_page/app/_components/DirectionsBlock.tsx

@@ -4,8 +4,8 @@ export function DirectionsBlock() {
   return (
     <section className="mt-20 pt-16 border-t border-line" id="directions">
       <div className="flex items-center gap-3 mb-6">
-        <span className="h-px w-8 bg-vermillion"></span>
-        <span className="font-mono text-xs tracking-widest uppercase text-vermillion font-bold">
+        <span className="h-px w-8 bg-cobalt-dark"></span>
+        <span className="font-mono text-xs tracking-widest uppercase text-cobalt-dark font-bold">
           Location & Contact
         </span>
       </div>
@@ -48,7 +48,7 @@ export function DirectionsBlock() {
               <span className="font-mono text-xs uppercase tracking-wider text-ink-mute w-20 pt-0.5">
                 관련 기관
               </span>
-              <div className="flex flex-wrap gap-x-4 gap-y-1 text-xs font-mono text-cobalt-dark dark:text-cobalt">
+              <div className="flex flex-wrap gap-x-4 gap-y-1 text-xs font-mono text-cobalt-dark">
                 <a href="http://www.knu.ac.kr/" target="_blank" rel="noreferrer" className="hover:underline">
                   경북대학교 (KNU) ↗
                 </a>