vane 0.9.1

A flow-based reverse proxy with multi-layer routing and programmable pipelines.
# Summary

Briefly describe what this PR does and why it exists.

- What problem does it solve?
- Why is this change necessary?

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## Type of Change

Select all that apply:

- [ ] Bug fix
- [ ] New feature
- [ ] Refactor
- [ ] Typo
- [ ] Documentation
- [ ] Test-related
- [ ] Other (explain below)

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## Scope & Size

- [ ] This PR is small and focused
- [ ] This PR is part of a larger change and will be followed by additional PRs

If this is a large change, explain how it is split and why.

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## Checklist

By submitting code PR, I confirm that:

- [ ] All code passes the language’s default lint / check tools
- [ ] All code is formatted using the language’s default formatter
- [ ] No single source file exceeds ~1000 lines without justification
- [ ] All new or changed source files include the required file header
- [ ] Comments are added only where context or decisions require them
- [ ] Comments are written in English
- [ ] Tests are included or updated where applicable
- [ ] `CHANGELOG.md` is updated under **Unreleased** (if required)
- [ ] This PR follows the project’s Contributing Guidelines
- [ ] I understand that maintainers have final decision authority

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## Use of LLMs / AI Tools

- [ ] No AI tools were used
- [ ] AI tools were used **only as implementation assistance**
- [ ] Architecture and design decisions were made by youself

If AI tools were used, briefly describe how.

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## Related Issues

Link related issues or discussions, if any.

Closes # (if applicable)

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## Additional Notes

Anything maintainers should know before reviewing.