feat(postgres): add doc on RBAC for Postgres

[Amogh-Bharadwaj]

Summary

Adds a document on the Postgres Service role-based access control and how to assign view and manage permissiosn for Postgres services

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/vercel.json
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

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Note

Low Risk
Documentation-only change with no product or security logic; sidebar entry exposes the new page in navigation.

Overview
Adds a new Managed Postgres RBAC reference page that documents Cloud org roles for Postgres: View Postgres services and Manage Postgres services, notes that creating services still needs Organization manage, and walks through creating a scoped Postgres Service role and assigning it from Users and roles (with UI screenshots).

Registers cloud/managed-postgres/rbac in the Managed Postgres (Beta) sidebar, placed after security.

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[vercel]

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Project	Deployment	Actions	Updated (UTC)
clickhouse-docs	Ready	Preview, Comment	Jun 3, 2026 10:16pm

4 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
clickhouse-docs-jp	Ignored		Jun 3, 2026 10:16pm
clickhouse-docs-ko	Ignored	Preview	Jun 3, 2026 10:16pm
clickhouse-docs-ru	Ignored	Preview	Jun 3, 2026 10:16pm
clickhouse-docs-zh	Ignored	Preview	Jun 3, 2026 10:16pm

[mintlify]

Docs PR opened: ClickHouse/mintlify-docs-dev#118

Added a Managed Postgres RBAC reference page describing available permissions and how to create and assign custom roles.

Once this PR is merged, we'll do a second pass to capture any additional changes and update the docs PR.

[Blargian]

LGTM

[mintlify]

Docs PR opened: ClickHouse/mintlify-docs-dev#120

Added a new Managed Postgres RBAC reference page documenting view and manage permissions for Postgres services.