Add GHES support to the review agent

[brianphillips]

Summary

• cache common GitHub App options and build Octokit instances per API base URL so the review agent can talk to GHES
• look for the x-github-enterprise-host header, normalize the URL, and reuse per-host App instances via a small cache
• lowercase webhook headers so the handler can always read x-github-event and log which base URL is in use

Testing

• yarn workspace @sourcebot/web lint

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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