Update from code changes: migrate docs to urbackend.in domains

[mintlify]

Summary

Moves every docs URL off the old bitbros.in hosts to the new urbackend.in production domains. Adds a deprecation notice for the 30 October cutoff.

Changes

• Swapped https://api.ub.bitbros.in for https://api.urbackend.in in all guides, API reference pages, concepts, the quickstart and the introduction.
• Pointed dashboard links to https://app.urbackend.in. Pointed dashboard/admin API calls (mail log endpoints, BYOK endpoints) to https://platform-api.urbackend.in.
• Added a deprecation warning with an old-host → new-host table to the API overview.
• Added notes to the SDK overview and UrProvider pages. They tell readers to set baseUrl explicitly, because the SDK defaults still point to the old host.

Context

• feat(landing): expand marketing site, add SEO metadata, trust badges,… #408 announced the new domains. The old hosts stay live until 30 October, then they are deprecated.

[mintlify]

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Project	Status	Preview	Updated
urbackend	🟢 Ready	View Preview	Sep 25, 2026, 5:09 AM

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Project	Deployment	Actions	Updated
ur-backend-web-dashboard	Ready	Preview	Sep 25, 2026 5:11am UTC
urbackend	Ready	Preview	Sep 25, 2026 5:11am UTC

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