feat: implement layout 3-tier container architecture, desktop screen token, Gate 8 no-escape rule, and clean dead code

refer_landing_page/app/page.tsx

@@ -58,7 +58,7 @@ export default function HomePage() {
   const pubCount = publications.length + patents.length;
 
   return (
-    <div className="space-y-16 py-6">
+    <div className="container-content space-y-16 py-6">
       {/* Hero Section */}
       <section className="relative">
         <div className="flex items-center gap-3 mb-4">