Use logging module for INFO help messages

[yoshibase]

Replace direct stderr prints with the standard logging framework so applications can suppress or redirect Fire informational messages.

Fixes #353

[google-cla]

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[yoshibase]

Pausing this PR for now: the cla/google check requires signing Google's CLA, and our contributor policy currently excludes repositories that require CLA signing. The fix remains prepared locally and can be resubmitted once CLA signing is feasible. Thank you for understanding.