fix(api): use structured placeholders in health logging

Author: SaitejaKommi

app/api.py

@@ -267,5 +267,5 @@ def healthcheck():
     from app.health import health
 
     message, status, _ = health.run()
-    logger.warning("HEALTH:", message, status)
+    logger.warning("HEALTH: %s %s", message, status)
     return Response(content=message, status_code=status, media_type="application/json")