ci: 👷 Update Rust toolchain to nightly in format workflow

[onuralpszr]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Moves the Rust template to a nightly toolchain with enhanced formatting/linting setup and updated crate metadata for smoother development and publishing. 🚀

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📊 Key Changes

• 🔧 Switched GitHub Actions workflows from stable to nightly Rust toolchain for both formatting and publishing.
• 🧩 Explicitly installs rustfmt in the format workflow, and rustfmt + clippy in the publish workflow.
• 📦 Bumped crate version from 0.0.4 to 0.0.5.
• 📚 Added a documentation URL (https://docs.ultralytics.com) to Cargo.toml.
• 🛠️ Introduced a rust-toolchain.toml file to pin the project to nightly with common components (rustfmt, clippy, rust-src, rust-analyzer) and major targets.
• ✨ Updated rustfmt.toml to enable unstable_features, allowing use of nightly-only rustfmt options.

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🎯 Purpose & Impact

• ✅ Ensures consistent, reproducible tooling across local development and CI by standardizing on the nightly toolchain.
• 🧹 Improves code quality and style enforcement with stricter formatting and linting in CI (via rustfmt and clippy).
• 🔄 Makes it easier for contributors to get a fully configured Rust environment (analyzers, sources, and targets) with no extra setup.
• 📖 Provides a clear link to Ultralytics documentation from the crate, improving discoverability for users.
• 📦 Version bump signals a tooling/config update, helping downstream users track changes and upgrades.

[UltralyticsAssistant]

👋 Hello @onuralpszr, thank you for submitting a ultralytics/template-rust 🚀 PR! This is an automated review assistant, and a Ultralytics engineer will be with you shortly. In the meantime, to ensure a seamless integration of your work, please review the following checklist:

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[UltralyticsAssistant]

🔍 PR Review

_{Made with ❤️ by Ultralytics Actions}

CI now installs nightly rustfmt, but without pinning a date the workflow may fail whenever nightly formatting changes. Please lock the nightly toolchain version (or otherwise constrain it) to keep format checks deterministic.

💬 Posted 1 inline comment

[UltralyticsAssistant]

🚀 PR merged and it’s a big win for the Rust ecosystem around Ultralytics — amazing work, @onuralpszr, and thanks to @glenn-jocher for the collaboration on this one!

“Great things are done by a series of small things brought together.” – Vincent van Gogh

This PR is a perfect example of that: moving the template to a nightly toolchain, tightening up rustfmt/clippy integration, pinning rust-toolchain.toml, and polishing crate metadata all combine to create a smoother, more reliable development and publishing experience for everyone.

Standardizing on nightly, reinforcing CI checks, and wiring in documentation and versioning all help future contributors get productive faster and ship higher-quality Rust projects with confidence.

Thank you for investing this level of care into the template—your work will quietly power a lot of future projects. 💡