🎨 style: remove overly vibrant colors and simplify UI design

- Remove colorful gradient backgrounds from dashboard panel headers in Detail page
- Replace custom header styling with default Semi-UI card title styling
- Remove background images and gradient overlays from all authentication pages
- Simplify authentication page layouts with clean gray backgrounds
- Update title text colors from white to dark gray for better contrast
- Remove unnecessary z-index layering and complex positioning
- Clean up unused background image imports

This change creates a more professional and consistent visual appearance
across the application by removing distracting visual elements.

web/src/pages/Setup/index.js

@@ -133,7 +133,7 @@ const Setup = () => {
   };
 
   return (
-    <div className="min-h-screen bg-gray-50">
+    <div className="bg-gray-50">
       <Layout>
         <Layout.Content>
           <div className="flex justify-center px-4 py-8">