fix: improve maintenance and synchronize live conversations

backend/app/api/chat.py

@@ -14,14 +14,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-from fastapi import APIRouter, Depends, HTTPException, Query, Request
+from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy.orm import Session
 from typing import List, Optional
 from datetime import datetime
 from app.models.schemas.chat import ChatOverviewResponse, ChatDetailResponse
-from app.core.auth import get_current_user, require_permissions, get_unified_chat_auth
-from app.services.shopify_session import require_shopify_or_jwt_auth
-from app.models.user import User
+from app.core.auth import get_unified_chat_auth
 from app.database import get_db
 from app.repositories.chat import ChatRepository
 from app.models.session_to_agent import SessionStatus
@@ -29,7 +27,6 @@ from app.core.params import MAX_DB_INT
 from app.core.logger import get_logger
 from uuid import UUID
 
-from fastapi import status
 
 
 router = APIRouter()