fix(lint): resolve ruff lint errors

- Remove unused imports (json, datetime, timedelta, Any, Optional, IntelligentEval)
- Remove unused variable (estimated_sessions)
- Remove whitespace from blank line
- Organize import blocks

All ruff checks passing.

backend/agenteval/intelligent_eval/alerts.py

@@ -10,13 +10,12 @@ Notifications:
 - Optional webhook notifications
 """
 
-import json
 import logging
-from datetime import datetime, timedelta
-from typing import Any, Optional
+from datetime import datetime
+from typing import Optional
 
 import httpx
-from sqlmodel import Session, SQLModel, Field, select
+from sqlmodel import Field, Session, SQLModel, select
 
 from agenteval.intelligent_eval.metrics import (
     calculate_pool_utilization,

backend/agenteval/intelligent_eval/cron_pool.py

@@ -5,8 +5,7 @@ intelligent evaluation. Pool automatically scales up/down based on load.
 """
 
 import logging
-from datetime import datetime, timedelta
-from typing import Optional
+from datetime import timedelta
 
 from sqlmodel import Session, select
 

backend/agenteval/intelligent_eval/decision.py

@@ -101,7 +101,7 @@ def _count_sessions_in_slot(
         return 0
 
     start_hour, end_hour = parsed
-    
+
     # Convert to naive datetime for SQLite comparison
     slot_start = (as_utc(eval_started_at) + timedelta(hours=start_hour)).replace(tzinfo=None)
     slot_end = (as_utc(eval_started_at) + timedelta(hours=end_hour)).replace(tzinfo=None)

backend/agenteval/intelligent_eval/metrics.py

@@ -8,7 +8,6 @@ Calculates:
 - Eval completion rate
 """
 
-from datetime import datetime, timedelta
 from typing import Optional
 
 from sqlmodel import Session, select

backend/agenteval/intelligent_eval/task_queue.py

@@ -7,12 +7,12 @@ OpenClaw workers to pick up. Tasks are prioritized by:
 3. Wait time (等待时间长)
 """
 
-from datetime import datetime, timedelta
+from datetime import timedelta
 from typing import Optional
 
 from sqlmodel import Session, select
 
-from agenteval.intelligent_eval.models import IntelligentEval, IntelligentEvalStatus
+from agenteval.intelligent_eval.models import IntelligentEvalStatus
 from agenteval.storage.db import (
     IntelligentEvalDB,
     IntelligentEvalSessionDB,
@@ -56,7 +56,6 @@ def _calculate_session_deficit(eval_db: IntelligentEvalDB, session: Session) ->
 
     plan = eval_db.get_plan()
     time_distribution = plan.get("time_distribution", [])
-    estimated_sessions = plan.get("estimated_sessions", 0)
 
     # Count current sessions
     current_sessions = session.exec(

backend/agenteval/web/routers/intelligent_evals.py

@@ -314,10 +314,8 @@ async def create_decision_log(
     session: Session = Depends(get_db),
 ) -> dict:
     """Create a decision log entry for an intelligent eval."""
-    from agenteval.storage.db import IntelligentEvalDecisionLogDB
-
     # Verify eval exists
-    from agenteval.storage.db import IntelligentEvalDB
+    from agenteval.storage.db import IntelligentEvalDB, IntelligentEvalDecisionLogDB
 
     eval_db = session.get(IntelligentEvalDB, eval_id)
     if eval_db is None:

backend/agenteval/web/routers/openclaw_cron_pool.py

@@ -1,6 +1,5 @@
 """API routes for OpenClaw cron pool management."""
 
-from datetime import datetime
 
 from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel, Field