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Move signal_alert out of python/common.py into a dedicated python/signal_alert.py module and update its importers (validate_system.py, snapshot_manager.py) to the new path. Relocate the signal_alert tests from tests/test_common.py into tests/test_signal_alert.py, repatching python.signal_alert.logger and python.signal_alert.Apprise to match the new module.