fix: improve maintenance and synchronize live conversations

backend/app/api/agent.py

@@ -16,13 +16,12 @@ limitations under the License.
 
 import os
 from fastapi import APIRouter, Depends, HTTPException, status, UploadFile, File, Request
-from typing import List, Union
+from typing import List
 from app.core.logger import get_logger
 from app.database import get_db
 from app.models.user import User, UserGroup
 from app.core.auth import (
     INBOX_PERMISSIONS,
-    get_current_user,
     require_any_permission,
     require_any_unified_permission,
     require_permissions,
@@ -30,7 +29,7 @@ from app.core.auth import (
 )
 from app.repositories.agent import AgentRepository
 from app.repositories.knowledge import KnowledgeRepository
-from app.models.schemas.agent import AgentUpdate, AgentResponse, AgentCreate, AgentRosterItem, AgentWithCustomizationResponse
+from app.models.schemas.agent import AgentUpdate, AgentCreate, AgentRosterItem, AgentWithCustomizationResponse
 from sqlalchemy.orm import Session
 from app.models.agent import Agent, AgentCustomization
 from app.models.organization import Organization
@@ -718,7 +717,7 @@ async def generate_instructions(
         
         # Check if enterprise module is available
         try:
-            from app.enterprise.repositories.subscription import SubscriptionRepository
+            from app.enterprise.repositories.subscription import SubscriptionRepository  # noqa: F401 - presence check preserves the optional enterprise contract
             HAS_ENTERPRISE = True
         except ImportError:
             HAS_ENTERPRISE = False