Support server health check by http://localhost:<port>/v1/system/healthz (#10150)

### What problem does this PR solve?

Support server health check. Solved issue: #10106

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/system_app.py

@@ -37,7 +37,7 @@ from timeit import default_timer as timer
 
 from rag.utils.redis_conn import REDIS_CONN
 from flask import jsonify
-from api.utils.health import run_health_checks
+from api.utils.health_utils import run_health_checks
 
 @manager.route("/version", methods=["GET"])  # noqa: F821
 @login_required