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When DNSWATCHER_TARGETS is empty or unset (the default), dnswatcher now exits with a clear error message instead of silently starting with nothing to monitor. Added ErrNoTargets sentinel error returned from config.New when both domains and hostnames lists are empty after target classification. This causes the fx application to fail to start, preventing silent misconfiguration. Also extracted classifyAndValidateTargets and parseDurationOrDefault helper functions to keep buildConfig within the funlen limit. Closes #69