fix: correct Docker healthcheck endpoint path

Dockerfile

@@ -30,7 +30,7 @@ EXPOSE 7860
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-    CMD curl -f http://localhost:7860/health || exit 1
+    CMD curl -f http://localhost:7860/api/health || exit 1
 
 # Run
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]