Clean up authentication troubleshooting artifacts

- Remove debug files: debug-login.js, LOGIN_FIX_SUMMARY.md, CUSTOM_LOGIN_IMPLEMENTATION.md
- Remove sequential-thinking directory (temporary MCP setup)
- Clean up verbose console logging in auth middleware
- Reduce debug output in direct login API while keeping essential logs
- Streamline session management logging
- Update .gitignore to prevent future debug file commits
- Maintain essential error logging and security logs

All authentication functionality remains intact and working.

middleware/auth.ts

@@ -7,23 +7,12 @@ export default defineNuxtRouteMiddleware(async (to) => {
   // Use the same auth system as the rest of the app
   const { isAuthenticated, checkAuth, user } = useAuth();
   
-  console.log('🛡️ Auth middleware running for:', to.path);
-  
   // Ensure auth is checked if user isn't loaded
   if (!user.value) {
-    console.log('🔄 User not loaded, checking auth...');
     await checkAuth();
   }
 
-  console.log('✅ Auth middleware check:', { 
-    isAuthenticated: isAuthenticated.value, 
-    user: user.value?.email 
-  });
-
   if (!isAuthenticated.value) {
-    console.log('❌ User not authenticated, redirecting to login');
     return navigateTo('/login');
   }
-  
-  console.log('✅ Auth middleware passed, allowing access to:', to.path);
 });