✨ 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/components/layout/PageLayout.js

@@ -11,7 +11,7 @@ import { API, getLogo, getSystemName, showError, setStatusData } from '../../hel
 import { UserContext } from '../../context/User/index.js';
 import { StatusContext } from '../../context/Status/index.js';
 import { useLocation } from 'react-router-dom';
-const { Sider, Content, Header, Footer } = Layout;
+const { Sider, Content, Header } = Layout;
 
 const PageLayout = () => {
   const [userState, userDispatch] = useContext(UserContext);
@@ -94,8 +94,6 @@ const PageLayout = () => {
       </Header>
       <Layout
         style={{
-          marginTop: '64px',
-          height: 'calc(100vh - 64px)',
           overflow: styleState.isMobile ? 'visible' : 'auto',
           display: 'flex',
           flexDirection: 'column',