chore(deps): migrate svelte-sitemap from CLI to Vite plugin

[josecelano]

Summary

Migrate svelte-sitemap from the deprecated CLI postbuild script to the recommended Vite plugin. This eliminates the deprecation warning on every build.

Changes

• Add svelteSitemap({ domain: 'https://torrust.com/' }) plugin to vite.config.ts
• Remove postbuild script from package.json

Checklist

• npm run lint passes
• npm run check passes
• npm run build succeeds — sitemap now generated via Method: Vite plugin (no deprecation warning)

[josecelano]

ACK c179bb2

[Copilot]

Pull request overview

Migrates sitemap generation in this SvelteKit/Vite codebase from the deprecated svelte-sitemap CLI (npm postbuild hook) to the recommended Vite plugin, so sitemap generation happens during vite build without the deprecation warning.

Changes:

• Register svelteSitemap({ domain: 'https://torrust.com/' }) in vite.config.ts.
• Remove the postbuild npm lifecycle script that invoked the deprecated CLI.

Reviewed changes

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

File	Description
vite.config.ts	Adds the svelte-sitemap Vite plugin to generate sitemap.xml as part of the Vite build pipeline.
package.json	Removes the deprecated postbuild script that ran the svelte-sitemap CLI.

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