fix: improve maintenance and synchronize live conversations

backend/app/utils/agno_utils.py

@@ -19,11 +19,10 @@ from agno.agent import Agent
 from agno.models.openai import OpenAIChat
 from openai import AsyncOpenAI, OpenAI
 from app.core.logger import get_logger
-from app.core.config import settings
 from app.core.outbound_http import guarded_async_http_client, guarded_http_client
 from app.core.outbound_policy import check_outbound_target, public_only
 from app.utils.agno_patches import apply_agno_patches
-from typing import Dict, Any, Optional, List
+from typing import Dict, Any, Optional
 from fastapi import HTTPException
 
 logger = get_logger(__name__)

backend/app/utils/guardrail_runtime.py

@@ -28,7 +28,7 @@ Every entry point here FAILS OPEN: a guardrail bug must degrade to
 "no guardrail", never to "no chat".
 """
 
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from typing import List, Optional, Tuple
 
 from app.agents.guardrail_policy import CANARY_STRINGS, looks_like_scope_refusal

backend/app/utils/response_parser.py

@@ -16,7 +16,7 @@ limitations under the License.
 
 import json
 import re
-from typing import Any, Dict, Optional, Type, Union
+from typing import Any, Dict, Type
 from app.core.logger import get_logger
 from app.models.schemas.chat import ChatResponse