✨ feat(homepage): enhance banner visuals & UX

• Added read-only Base URL input that shows `status.server_address` (fallback `window.location.origin`) and copies value on click.
• Embedded `ScrollList` as input `suffix`; auto-cycles common endpoints every 3 s and allows manual selection.
• Introduced `API_ENDPOINTS` array in `web/src/constants/common.constant.js` for centralized endpoint management.
• Implemented custom CSS to hide ScrollList wheel indicators / scrollbars for a cleaner look.
• Created two blurred colour spheres behind the banner (`blur-ball-indigo`, `blur-ball-teal`) with light-/dark-mode opacity tweaks and lower vertical placement.
• Increased letter-spacing for Chinese heading via conditional `tracking-wide` / `md:tracking-wider` classes to improve readability.
• Misc: updated imports, helper functions, and responsive sizes to keep UI consistent across devices.

web/src/pages/NotFound/index.js

@@ -6,7 +6,7 @@ import { useTranslation } from 'react-i18next';
 const NotFound = () => {
   const { t } = useTranslation();
   return (
-    <div className="flex justify-center items-center h-screen p-8">
+    <div className="flex justify-center items-center h-screen p-8 mt-[64px]">
       <Empty
         image={<IllustrationNotFound style={{ width: 250, height: 250 }} />}
         darkModeImage={<IllustrationNotFoundDark style={{ width: 250, height: 250 }} />}