[Docs] Expand the Box sandbox provider guide

[roomote-roomote]

​Opened on behalf of @mrubens. Follow up by mentioning @roomote-roomote, in the web UI, or in Slack.

What changed

• expanded the Box sandbox provider guide with a direct API-key setup link, configuration defaults, supported workflows, verification steps, and troubleshooting
• added the official Box mark as one shared local asset used by the provider page and Sandboxes Overview
• tightened the release documentation audit so newly added or materially updated providers and integrations are checked for missing, generic, inconsistent, or duplicated logo references

Why this change was made

The existing Box page did not fully explain how to configure and validate the provider, and its generic icon did not match the provider’s branding. The release documentation audit also lacked an explicit check for icon coverage and centralized logo references.

Impact

Operators get a complete Box setup guide with consistent branding, while future provider and integration documentation updates are less likely to ship with missing icons or divergent logo references.

Screenshots

[roomote-community]

No code issues found. See task

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