Add comprehensive social media management system and improve admin pages

## Social Media Management System
- Add SocialMediaLink database model with platform, URL, icon, and ordering
- Create complete CRUD API endpoints for admin social media management
- Implement admin social media management page with Material-UI DataGrid
- Add "Social Media" menu item to admin navigation
- Update footer to dynamically load and display enabled social media links
- Support multiple platforms: Facebook, Twitter, Instagram, YouTube, LinkedIn, GitHub, TikTok
- Include proper icon mapping and fallback handling

## Admin Pages Improvements
- Replace broken TinyMCE editor with working WYSIWYG rich text editor
- Create SimpleRichEditor component with toolbar for formatting
- Fix admin authentication to use cookies instead of localStorage tokens
- Update all admin API calls to use credentials: 'include'
- Increase content editor height to 800px for better editing experience
- Add Lexical editor component as alternative (not currently used)

## Footer Pages System
- Create 8 comprehensive footer pages: About, Blog, Support, API Docs, Terms, Privacy, Cookies, GDPR
- Implement dynamic footer link management with smart categorization
- Separate Quick Links and Legal sections with automatic filtering
- Remove duplicate hardcoded links and use database-driven system
- All footer pages are fully written with professional content

## Database & Dependencies
- Add uuid package for ID generation
- Update Prisma schema with new SocialMediaLink model and relations
- Seed default social media links for Facebook, Twitter, Instagram, YouTube
- Add Lexical rich text editor packages (@lexical/react, etc.)

## Technical Improvements
- Fix async params compatibility for Next.js 15
- Update MUI DataGrid deprecated props
- Improve admin layout navigation structure
- Add proper TypeScript interfaces for all new components
- Implement proper error handling and user feedback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/admin/layout/admin-layout.tsx

@@ -32,7 +32,8 @@ import {
   AccountCircle,
   AdminPanelSettings,
   Launch as LaunchIcon,
-  Article as PageIcon
+  Article as PageIcon,
+  Share
 } from '@mui/icons-material';
 
 interface AdminLayoutProps {
@@ -51,6 +52,7 @@ const menuItems = [
   { text: 'Dashboard', icon: Dashboard, href: '/admin' },
   { text: 'Users', icon: People, href: '/admin/users' },
   { text: 'Pages', icon: PageIcon, href: '/admin/pages' },
+  { text: 'Social Media', icon: Share, href: '/admin/social-media' },
   { text: 'Content Moderation', icon: Gavel, href: '/admin/content' },
   { text: 'Analytics', icon: Analytics, href: '/admin/analytics' },
   { text: 'Chat Monitoring', icon: Chat, href: '/admin/chat' },