fix(docker): use relative external URL for Prometheus

docker/scripts/start_space.sh

@@ -72,11 +72,8 @@ scrape_configs:
 EOF
 
 # Determine Prometheus External URL
-if [ -n "$SPACE_ID" ]; then
-    PROM_EXTERNAL_URL="https://huggingface.co/spaces/$SPACE_ID/prometheus/"
-else
-    PROM_EXTERNAL_URL="/prometheus/"
-fi
+# Always use relative path so it works on both huggingface.co and .hf.space domains
+PROM_EXTERNAL_URL="/prometheus/"
 
 # Start Prometheus
 # --web.external-url needs to match the public URL for correct link generation