Fix Phase 1 server validation defects

ansible/roles/cezen-backend/files/cezen-api.service

@@ -9,6 +9,7 @@ User=cezen
 WorkingDirectory=/opt/cezen/backend
 Environment="CEZEN_DATA=/opt/cezen/data"
 Environment="OLLAMA_URL=http://localhost:11434"
+Environment="CHROMA_URL=http://localhost:8100"
 Environment="PATH=/opt/cezen/backend/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"
 ExecStart=/opt/cezen/backend/venv/bin/uvicorn main:app --host 0.0.0.0 --port 8080 --workers 2
 Restart=always