fix(e7): CI-Gate-Vorbereitung — ruff über app/ von 105 auf 0 Findings bereinigt; 8 echte F821-NameError-Produktionsbugs behoben (external_api stream_chat-Call-Signatur an stream_chat_comm angepasst, agent_runner uuid vor lokalem Import, automation/plugin UserTenant-Import, tasks delete-audit user_id, workflows/engine timedelta, unified_search/contracts Any); py311-kompatibles StepHandler-Alias statt type-Statement; E402/F841 bereinigt; Verifikation 85/89 grün (4 Failures = bekannter Vorbestand BUG-099)

app/routes/approvals.py

@@ -7,7 +7,7 @@ from __future__ import annotations
 
 import logging
 import uuid
-from datetime import UTC, datetime
+from datetime import datetime
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -16,7 +16,6 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.approval import (
-    APPROVAL_STATUSES,
     ApprovalRequest,
     create_approval_request,
     expire_approval_request,