Fix Rhodibot CI formatting failures (#569)

Apply consistent Rust formatting across Rhodibot’s fleet, compliance,
sanitization, webhook, and integration test code. Normalize imports,
line wrapping, trailing commas, and match arms without changing
behavior.

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task](https://app.coderabbit.ai/code/tasks/b669491d-b99e-4ea8-afdf-7bc9268eb5b3?source=coding_agent_github_pr_description)

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Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: Jonathan Jewell <jonathan.jewell@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: 3 people