Fix (search): Optimize the search page functionality and UI #3221 (#9525)

### What problem does this PR solve?

Fix (search): Optimize the search page functionality and UI #3221 

- Add a search list component
- Implement search settings
- Optimize search result display
- Add related search functionality
- Adjust the search input box style
- Unify internationalized text

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/components/ragflow-avatar.tsx

@@ -49,7 +49,7 @@ export const RAGFlowAvatar = memo(
     const initials = getInitials(name);
     const { from, to } = name
       ? getColorForName(name)
-      : { from: 'hsl(0, 0%, 80%)', to: 'hsl(0, 0%, 30%)' };
+      : { from: 'hsl(0, 0%, 30%)', to: 'hsl(0, 0%, 80%)' };
 
     const fallbackRef = useRef<HTMLElement>(null);
     const [fontSize, setFontSize] = useState('0.875rem');