- Implement environment-aware API base URL detection
* Auto-detects localhost vs production environment
* Uses http://localhost:3002 for local development
* Uses relative URLs for production deployment
- Add placeholder translation support
* Extended applyTranslations() to handle data-translate-placeholder
* Fixed language mismatch where interface was German but placeholder stayed English
* Now properly translates placeholder text when switching languages
- Update cache-busting versions to force browser reload
* Updated from v=20250629181500 to v=20250630173957
* Ensures browser loads updated JavaScript with fixes
- Verify full API connectivity working
* Local development server on port 3002 fully functional
* AI-powered Socratic teaching system working perfectly
* German/English language support complete
Resolves 502 Bad Gateway errors and language consistency issues.
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