fix: resolve ruff import ordering and unused import errors

Fixes 4 linting errors that were failing CI:
- Remove unused `shutil` import from bin/import_artemis.py
- Sort/format import blocks in routes/signalid.py and
  tests/test_signalid_match_route.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bin/import_artemis.py

@@ -25,7 +25,6 @@ import argparse
 import json
 import os
 import re
-import shutil
 import sqlite3
 import subprocess
 import sys