chore: add Rslint

[chenjiahan]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

This PR replaces the repository ESLint lint entrypoint with Rslint. It adds rslint.config.ts, the @rslint/core dev dependency, a VS Code extension recommendation, and a GitHub Actions lint workflow that runs pnpm run lint.

Breaking Changes

None.

Additional Info

Validated locally with pnpm run lint.

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[Copilot]

Pull request overview

This PR migrates the repository’s JavaScript linting setup from ESLint to Rslint, updating config, dependencies, editor recommendations, and CI to run the new linter.

Changes:

• Added a new rslint.config.ts and updated package.json scripts to use rslint (with a --fix variant).
• Removed ESLint-related configuration/dependencies and updated the lockfile accordingly.
• Added VS Code extension recommendations and a GitHub Actions workflow to run pnpm run lint.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
rslint.config.ts	Introduces the Rslint configuration and test-file rule overrides.
package.json	Switches lint scripts/deps from ESLint to Rslint and adds a fix script.
pnpm-lock.yaml	Updates dependency graph for the new linter and removes ESLint packages.
.vscode/extensions.json	Recommends the Rslint VS Code extension (and Prettier).
.gitignore	Allows committing .vscode/extensions.json while ignoring other .vscode files.
.github/workflows/lint.yml	Adds CI lint job running pnpm run lint.
.eslintrc.js	Removes the ESLint configuration file.
.eslintignore	Removes ESLint ignore patterns (now needs an equivalent for Rslint).

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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