Add eslint config.

[v-craigjzgh]

This branch replicates #478.

[Copilot]

Pull request overview

Adds an ESLint flat config at the repository root (Next.js + Prettier) to enable npm run lint, and updates the lockfile accordingly.

Changes:

• Add eslint.config.js exporting a Next.js + Prettier ESLint configuration.
• Update package-lock.json dependency resolutions (notably @types/node and undici-types).

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
package-lock.json	Updates locked dependency versions/resolutions, including @types/node and undici-types.
eslint.config.js	Introduces root ESLint flat config using eslint-config-next and eslint-config-prettier.

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