Fix API health check and complete comment timestamp implementation

docker-compose.yml

@@ -58,7 +58,7 @@ services:
       redis:
         condition: service_healthy
     healthcheck:
-      test: ["CMD-SHELL", "curl -f http://localhost:8000/health || exit 1"]
+      test: ["CMD-SHELL", "uv run python -c \"import httpx; exit(0 if httpx.get('http://localhost:8000/api/health').status_code == 200 else 1)\" || exit 1"]
       interval: 20s
       timeout: 10s
       retries: 5