Resolve linter contradictions: consolidate config, fix isort first-party, pylint 10/10

Agent-Logs-Url: https://github.com/christianlouis/dmarq/sessions/1e4a1f06-55b9-4040-853e-6aaf9ee574c8

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/api/api_v1/endpoints/imap.py

@@ -2,11 +2,12 @@ import logging
 from datetime import datetime
 from typing import Any, Dict, Optional
 
-from app.core.security import require_admin_auth
-from app.services.imap_client import IMAPClient
 from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
 from pydantic import BaseModel
 
+from app.core.security import require_admin_auth
+from app.services.imap_client import IMAPClient
+
 router = APIRouter()
 logger = logging.getLogger(__name__)