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>

package.json

@@ -26,6 +26,13 @@
     "@emotion/styled": "^11.14.1",
     "@fontsource/roboto": "^5.2.8",
     "@formatjs/intl-localematcher": "^0.6.1",
+    "@lexical/html": "^0.35.0",
+    "@lexical/link": "^0.35.0",
+    "@lexical/list": "^0.35.0",
+    "@lexical/plain-text": "^0.35.0",
+    "@lexical/react": "^0.35.0",
+    "@lexical/rich-text": "^0.35.0",
+    "@lexical/utils": "^0.35.0",
     "@mui/icons-material": "^7.3.2",
     "@mui/lab": "^7.0.0-beta.17",
     "@mui/material": "^7.3.2",
@@ -53,6 +60,7 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "jsonwebtoken": "^9.0.2",
+    "lexical": "^0.35.0",
     "lucide-react": "^0.544.0",
     "negotiator": "^1.0.0",
     "next": "^15.5.3",
@@ -74,6 +82,7 @@
     "tailwindcss": "^4.1.13",
     "tinymce": "^8.1.2",
     "typescript": "^5.9.2",
+    "uuid": "^13.0.0",
     "zod": "^3.25.76",
     "zustand": "^5.0.8"
   },