TODO.md: Add Markdown editor, plugin enable/disable, plugin API,
file uploads, map management, activity log, and more admin features.
Remove resolved items (extract/AuthController/CSRF - replaced by new admin).
AGENTS.md: Document full project structure including admin-console,
add AI model info (claude-opus-4-6), admin routing, security practices.
- Fix path traversal with realpath() validation in getPage() and executePhpFile()
- Remove insecure JWT secret fallback, require JWT_SECRET env var
- Fix IP spoofing by only trusting proxy headers from configured proxies
- Add Secure/HttpOnly/SameSite flags to all cookies
- Use env var for debug mode instead of hardcoded true
- Fix operator precedence bug in MQTTTracker track_user_flows check
- Remove dead code: duplicate is_dir() block, unused scanForPageNames()
- Remove htmlspecialchars() from filesystem path operations
- Remove duplicate require_once calls and redundant autoloader includes
- Fix unclosed </div> in getDirectoryListing()
- Escape breadcrumb titles and add lang param to search result URLs
- Make language prefixes dynamic from config instead of hardcoded nl|en
- Make HTML lang attribute dynamic, add go_to translation key
- Add aria-label/aria-expanded to sidebar toggle for accessibility
- Fix event listener leak in app.js using event delegation
- Remove console.log from production code
- Update guides (NL/EN) with sidebar toggle documentation
- Add TODO.md documenting all identified improvements
