docs: add islo.dev under Community Providers

[zozo123]

Summary

Adds an islo.dev page under a new Community Providers section in the docs, per build-a-provider.

agentbox-provider-islo is a community provider plugin for islo.dev microVMs, hosted and published separately (not in this repo):

• Repo: https://github.com/zozo123/agentbox-provider-islo
• npm: agentbox-provider-islo

It's a thin CloudBackend over the official @islo-labs/sdk, built only on @madarco/agentbox-provider-sdk@^1, exporting providerModule with agentbox.providerApiVersion: 1 — following the package requirements in the docs.

What's in this PR

Docs only — apps/web/content/docs/islo.mdx + a Community Providers entry in content/docs/meta.json. (The plugin previously lived in examples/ in an earlier revision of this branch; per maintainer guidance it now lives in its own repo, so this PR is docs-only.)

The plugin (in its own repo)

Verified end-to-end against the live islo API: provision→running, exec (clean stdout + exit codes), file upload/download round-trip, listFiles, previewUrl, pause→resume, list, destroy. agentbox plugin add registers islo (SDK v1) and agentbox doctor renders the islo: group. Backend mapping (name-addressed cloud; two-step async exec; multipart file transfer; public shares for preview) is documented in the repo README.

prepare (native base-image baking) and no-SSH buildAttach are noted as follow-ups, as the docs describe for cloud providers.

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