🔧 Update Admin Dashboard and Authentication Flow

✅ Updated Admin Dashboard URL:
- Changed the Admin Dashboard access path from `/admin` to `/manage` in multiple files for consistency.

✅ Enhanced Middleware Authentication:
- Updated middleware to protect new admin routes including `/manage` and `/dashboard`.

✅ Implemented CSRF Protection:
- Added CSRF token generation and validation for login and session validation routes.

✅ Introduced Rate Limiting:
- Added rate limiting for admin routes and CSRF token requests to enhance security.

✅ Refactored Admin Page:
- Created a new admin management page with improved authentication handling and user feedback.

🎯 Overall Improvements:
- Strengthened security measures for admin access.
- Improved user experience with clearer navigation and feedback.
- Streamlined authentication processes for better performance.

DEV-SETUP.md

@@ -47,7 +47,7 @@ This starts only the Next.js development server without Docker services. Use thi
 ### 3. Access Services
 
 - **Portfolio**: http://localhost:3000
-- **Admin Dashboard**: http://localhost:3000/admin
+- **Admin Dashboard**: http://localhost:3000/manage
 - **PostgreSQL**: localhost:5432
 - **Redis**: localhost:6379
 
@@ -235,5 +235,5 @@ The production environment uses the production Docker Compose configuration.
 ## 🔗 Links
 
 - **Portfolio**: https://dk0.dev
-- **Admin**: https://dk0.dev/admin
+- **Admin**: https://dk0.dev/manage
 - **GitHub**: https://github.com/denniskonkol/portfolio