feat: Modernization & Supply Chain Hardening

[silvester-pari]

This PR brings @eox/eslint-config up to current industry standards while employing a non-breaking update strategy to avoid breaking CI pipelines across our 10-15 dependent projects.

What's Changed

• Dependencies Updated: Bumped ESLint (v9.39.4), Prettier (v3.8.3), and typescript-eslint (v8.59.3) to the latest stable versions. Ran npm audit fix for security patches.
• Native Vue 3 & JSDoc Integration: Added eslint-plugin-vue and eslint-plugin-jsdoc centrally to validate .vue components and ensure strict typing via JSDoc comments.
  • Note: To maintain backwards compatibility, all new Vue/JSDoc rules and updated TS rules have been dynamically mapped to "warn" rather than "error".
• Modular Exports: Refactored index.js to support modular imports. Developers can now use the entire "one-stop-shop" default export or explicitly pick what they need (js, typescript, vue3, cypress, jsdocRules, prettier) for lighter projects.
• Centralized TypeScript Config: Added tsconfig.base.json so downstream projects can extend a unified type-checking baseline rather than repeating compiler options.
• Supply Chain Security: Added Dependabot (.github/dependabot.yml) configured with a 7-day cooldown to protect against newly published, potentially malicious zero-day npm packages.