fix: healthcheck used curl, absent in python:3.11-slim

Container was killed as unhealthy (exit 137) on every start.
Use python urllib for the healthcheck instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docker-compose.yml

@@ -12,7 +12,7 @@ services:
     ports:
       - "8182:5000"
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:5000/"]
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:5000/')"]
       interval: 30s
       timeout: 10s
       retries: 3