fix(rust): enhance Rust code generation with improved error handling, dynamic directory creation, and support for WebSocket handlers and middlewares

[sophatvathana]

Summary

• fix(rust): enhance Rust code generation with improved error handling, dynamic directory creation, and support for WebSocket handlers and middlewares

Changes

• rust codegen

Testing

• cargo test
• cargo fmt --check
• Other (describe):

Checklist

• I updated relevant docs (README, CONTRIBUTING, etc.).
• I added tests or explained why they’re unnecessary.
• I verified CI passes locally or explained why it wasn’t run.

Screenshots / Notes (optional)

• Add screenshots, logs, or anything reviewers should see.