remove obsolete RELAY_AUTH_BLOCK conditional

simplify ENV_CONTENT construction now SAS auth is no longer injected
eliminate dead code and improve .env generation readability

Author: floormind

scripts/bash/deploy_arc_ring.sh

@@ -92,11 +92,6 @@ PACS_DB_PATH=${BASE_PATH}/data/pacs.db
 LOG_LEVEL=INFO
 SAMPLE_IMAGES_PATH=${BASE_PATH}/current/sample_images"
 
-  if [[ -n "${RELAY_AUTH_BLOCK}" ]]; then
-    ENV_CONTENT="${ENV_CONTENT}
-${RELAY_AUTH_BLOCK}"
-  fi
-
   # Cross-platform base64 encoding (works on macOS and Linux)
   ENV_CONTENT_B64=$(printf '%s' "$ENV_CONTENT" | base64 | tr -d '\n')