docs: port managed-postgres pricing page

[mintlify]

Summary

Ports the Managed Postgres pricing page from ClickHouse/clickhouse-docs#6286, including the new bullets about overlapping charges during scaling/maintenance and the fallback-to-older-generation instance billing note.

Changes

• Added products/managed-postgres/pricing.mdx (the page did not previously exist in this repo, so the full Docusaurus source was ported, not just the PR diff).
• Added the page to products/managed-postgres/navigation.json under "Features".
• Transforms applied:
  • BetaBadge import switched from @theme/badges/BetaBadge to /snippets/components/BetaBadge/BetaBadge.jsx.
  • :::tip[Pricing calculator] admonition converted to a Mintlify <Tip> component.
  • Docusaurus <div style={...}> tier cards converted to a <CardGroup cols={3}> with three <Card> entries.
  • Internal /docs/cloud/managed-postgres/... slug links rewritten to Mintlify file paths under /products/managed-postgres/....
  • /cloud/manage/cloud-tiers, /cloud/security/manage-my-account, /cloud/infrastructure/clickhouse-private rewritten to their Mintlify file paths.

Context

Upstream PR is an incremental update to the disclaimers list — two bullets reworded/added about overlapping charges during scaling/maintenance and a fallback-instance-type billing scenario. The full page is included here because the Mintlify version of the repo did not yet have it.

Ambiguity / follow-ups

• The Docusaurus tier comparison used custom-styled <div> cards with per-row bullets; this port collapses them into Mintlify <CardGroup> <Card> components. The visual presentation will differ.
• Pre-existing broken links in integrations/language-clients/java/jdbc.mdx to /integrations/sql-clients/sql-console remain — unrelated to this change.

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Note

Low Risk
Documentation-only addition with no runtime, auth, or data-path changes.

Overview
Adds the Managed Postgres pricing documentation page to Mintlify, ported from upstream ClickHouse docs, and registers it under the Features nav group.

The page documents tier pricing, calculators, and billing disclaimers—including overlapping charges during scaling/maintenance and billing when instances fall back to an older generation. Docusaurus-specific markup was converted to Mintlify patterns (BetaBadge snippet, <Tip>, <CardGroup>/<Card> instead of styled divs), and internal /docs/cloud/... links were rewritten to /products/... paths.

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Project	Status	Preview	Updated (UTC)
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