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>

tests/test_signalid_match_route.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+
 import pytest
 
 
@@ -10,6 +11,7 @@ import pytest
 def client():
     """Minimal Flask test client with only the signalid blueprint registered."""
     from flask import Flask
+
     from routes.signalid import signalid_bp
 
     app = Flask(__name__)