[SandObserver]

Summary

• Add Proxmox Backup Server and Backrest to the Backup widget page: service list entries, Provider and Link URL settings, and a section for each source.
• Document the PBS token role needed for running and failed backups.
• Document the PBS group picker limit of 20 datastores and 20 namespaces each.
• Document the six-request limit per service for ctx.fetchJSON, and truncated: true in an optionsFrom reply.
• Note that any Backrest user has full control of Backrest.
• Update the Backup row in the widget index.
• Add proxmox and backrest service icons in light and dark.

Testing
npm run build and npm run check pass.

Checklist

• npm run build and npm run check both pass.
• Product UI is shown by running or capturing it, never recreated in CSS.
• Any new preview or screenshot carries no private hostnames or real data.
• Visual changes verified in both colour schemes and both docs themes.
• Links to the app repo still resolve.

[cloudflare-workers-and-pages]

Deploying stackyard-docs with    Cloudflare Pages

Latest commit:	816441b
Status:	✅  Deploy successful!
Preview URL:	https://9b52706f.stackyard-docs.pages.dev
Branch Preview URL:	https://docs-backup-pbs-backrest.stackyard-docs.pages.dev

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