Feat: Alter flask to Quart for async API serving. (#11275)

### What problem does this PR solve?

#11277

### Type of change

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

admin/server/admin_server.py

@@ -20,8 +20,10 @@ import logging
 import time
 import threading
 import traceback
-from werkzeug.serving import run_simple
+
 from flask import Flask
+from flask_login import LoginManager
+from werkzeug.serving import run_simple
 from routes import admin_bp
 from common.log_utils import init_root_logger
 from common.constants import SERVICE_CONF
@@ -30,7 +32,6 @@ from common import settings
 from config import load_configurations, SERVICE_CONFIGS
 from auth import init_default_admin, setup_auth
 from flask_session import Session
-from flask_login import LoginManager
 from common.versions import get_ragflow_version
 
 stop_event = threading.Event()