lint: replace no-op flake8 script with gating ruff check, fix findings

backend/api/people.py

@@ -9,18 +9,18 @@ from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
 from sqlalchemy import func, or_
 from sqlalchemy.orm import Session
 
-from backend.db.session import get_db
-from backend.db.models import Person, Face, PersonEncoding, PhotoPersonLinkage, Photo
 from backend.api.auth import get_current_user_with_id
+from backend.db.models import Face, Person, PersonEncoding, Photo, PhotoPersonLinkage
+from backend.db.session import get_db
+from backend.schemas.faces import AcceptMatchesRequest, IdentifyFaceResponse, PersonFaceItem, PersonFacesResponse
 from backend.schemas.people import (
     PeopleListResponse,
+    PeopleWithFacesListResponse,
     PersonCreateRequest,
     PersonResponse,
     PersonUpdateRequest,
     PersonWithFacesResponse,
-    PeopleWithFacesListResponse,
 )
-from backend.schemas.faces import PersonFacesResponse, PersonFaceItem, AcceptMatchesRequest, IdentifyFaceResponse
 from backend.services.face_service import accept_auto_match_matches
 
 router = APIRouter(prefix="/people", tags=["people"])
@@ -267,7 +267,6 @@ def accept_matches(
     3. Updates person encodings (removes old, adds current)
     Tracks which user identified the faces.
     """
-    from backend.api.auth import get_current_user_with_id
     
     user_id = current_user["user_id"]
     try: