Global request body limit

[sxlijin]

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Issue Reference

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• This PR fixes/closes #[issue number]

Changes

Please describe the changes proposed in this pull request

This PR implements a global request body limit for the BAML runtime server.

• Replaced axum::extract::DefaultBodyLimit with tower_http::limit::RequestBodyLimitLayer to apply a global limit.
• Set the global request body limit to 50 MB (50 * 1024 * 1024 bytes) for all routes.
• Added tower-http dependency with the limit feature to engine/baml-runtime/Cargo.toml.
• Updated imports in engine/baml-runtime/src/cli/serve/mod.rs to reflect these changes.

Testing

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• Unit tests added/updated
• Manual testing performed
  • Ran cargo test -p baml-runtime --lib which resulted in all 147 tests passing.
  • Applied cargo fmt for code formatting.
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PR Checklist

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• I have read and followed the contributing guidelines
• My code follows the style guidelines of this project (via cargo fmt)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Additional Notes

Add any other context about the PR here

This change addresses the need for a global request body limit, replacing a more specific or default limit with a consistent approach across the server.

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Project	Deployment	Actions	Updated (UTC)
beps	Ready	Preview, Comment	Feb 23, 2026 6:55pm

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Project	Deployment	Actions	Updated (UTC)
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