feat: support install.rust()

[kemingy]

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[Copilot]

Pull Request Overview

This PR adds support for the Rust programming language to envd, enabling users to install Rust in their development environments using the install.rust() function.

• Implements Rust language support via rustup installation
• Adds frontend API and backend IR implementation for Rust installation
• Includes E2E test coverage to verify Rust installation functionality

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/lang/ir/v1/system.go	Adds "rust" case to language compilation logic with version support
pkg/lang/ir/v1/rust.go	New file implementing Rust installation via rustup with configurable version
pkg/lang/ir/v1/interface.go	Adds Rust() function to the IR interface
pkg/lang/frontend/starlark/v1/install/install.go	Adds ruleFuncRust to expose install.rust() to Starlark frontend
pkg/lang/frontend/starlark/v1/install/const.go	Adds ruleRust constant
envd/api/v1/install.py	Adds Python API documentation for rust() function
e2e/language/testdata/rust/build.envd	Test configuration file for Rust E2E test
e2e/language/rust_test.go	E2E test to verify Rust installation
go.mod	Updates Go version from 1.24.6 to 1.25.1
go.sum	Dependency updates (various package version bumps)

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