chore(lint): final ruff fixes

app/api/claude_md.py

@@ -10,7 +10,6 @@
 import datetime
 import logging
 from typing import Optional
-from urllib.parse import unquote
 
 import duckdb
 from fastapi import APIRouter, Depends, HTTPException, Query, Request, Response

app/api/tokens.py

@@ -1,7 +1,6 @@
 """Personal access token endpoints (#12)."""
 
 import hashlib
-import secrets
 import uuid
 from datetime import datetime, timezone, timedelta
 from typing import Optional, List