L'IP hardcoded Qdrant 172.21.0.5 era driftato a .3 (container senza IP statico) e
con php-fpm clear_env=no la env QDRANT_URL=172.21.0.5 (morta) veniva usata -> RAG web rotta.
Fix: QDRANT_URL e fallback VectorService usano l'hostname http://nis2-qdrant:6333,
risolto via Docker DNS sia in CLI sia in php-fpm. Verificato retrieval end-to-end (287 chunk).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>