feat: support install.nodejs()

[kemingy]

With python/nodejs, we should be able to install most of the code agents with the language package managers.

[Copilot]

Pull Request Overview

This PR adds NodeJS programming language support to envd, enabling users to install and use Node.js in their development environments via install.nodejs().

Key Changes:

• Implemented NodeJS installation functionality with configurable version support (default: 25.1.0)
• Added libatomic1 system package dependency required by nodejs
• Consolidated separate rust and golang e2e tests into a unified "others" test suite that includes nodejs

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/types/envd.go	Added libatomic1 to base apt packages for nodejs runtime dependency
pkg/lang/ir/v1/system.go	Integrated nodejs case handlers in language compilation logic
pkg/lang/ir/v1/nodejs.go	New file implementing nodejs installation from official release binaries
pkg/lang/ir/v1/interface.go	Added NodeJS() function to expose nodejs installation in IR API
pkg/lang/frontend/starlark/v1/install/install.go	Added starlark binding for install.nodejs() with version parameter
pkg/lang/frontend/starlark/v1/install/const.go	Added ruleNodeJS constant for the install rule
envd/api/v1/install.py	Added Python API documentation for nodejs() function
e2e/language/testdata/rust/build.envd	Removed rust-specific test configuration (consolidated into others)
e2e/language/testdata/others/build.envd	New consolidated test configuration for go, rust, and nodejs
e2e/language/testdata/golang/build.envd	Removed golang-specific test configuration (consolidated into others)
e2e/language/others_test.go	Updated to test go, rust, and nodejs installation in single suite

Comments suppressed due to low confidence (1)

e2e/language/others_test.go:24

• The test suite description still says "rust" but now tests multiple languages (rust/golang/nodejs). This should be updated to reflect the broader scope, such as "other languages" or "rust/golang/nodejs".

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