I made several improvements to the middleware

[ShiruvatiNarasimha]

Hey @hkirat ,

This PR improves the authentication middleware by adding robust error handling, enhanced security measures, and better code quality practices. The changes make the middleware more reliable, secure, and maintainable.

Key Changes
🛡️ Error Handling

Implemented comprehensive try/catch blocks for better error management
Added detailed error logging for improved debugging capabilities
Enhanced error messages for clearer problem identification

🔒 Security Enhancements

Implemented proper type checking for token and user data validation
Disabled caching for user validation requests to prevent security vulnerabilities
Added appropriate headers for API fetch requests

💻 Code Quality Improvements

Added explicit return type for local CMS provider scenario
Implemented null checking with optional chaining to prevent runtime errors
Added validation for environment variables
Enhanced NextAuth configuration with proper options

📝 Documentation

Added inline comments explaining the code flow
Included type checking documentation

Testing

Tested with both local CMS provider enabled and disabled
Verified error handling with various failure scenarios
Confirmed proper redirection on authentication failures
Validated environment variable handling

Dependencies

No new dependencies added
Requires proper environment variables to be set:

NEXT_PUBLIC_BASE_URL_LOCAL
LOCAL_CMS_PROVIDER