style: apply ruff-format to entire codebase

First-time run of ruff-format via pre-commit hook normalises quote
style, trailing commas, and whitespace across 188 Python files.
No logic changes.

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

tests/test_signalid_match_route.py

@@ -91,6 +91,7 @@ class TestSignalidMatchRoute:
 
     def test_cached_true_on_second_identical_request(self, client):
         import routes.signalid as signalid_module
+
         signalid_module._match_cache.clear()
         payload = json.dumps({"frequency_mhz": 98.5})
         client.post("/signalid/match", data=payload, content_type="application/json")