docs: restore curl Quick install; add clickhousectl install page

[mintlify]

Summary

Ports ClickHouse/clickhouse-docs#6343 to the Mintlify docs: restores the curl-based Quick install flow and adds a dedicated clickhousectl install page so both local-development methods are documented side by side.

Changes

• snippets/_quick_install.mdx — restored the curl flow (single binary), added the CLICKHOUSE_ONLY=1 note, fixed a typo (comand), and dropped the ~/.local/bin PATH detail per upstream.
• core/get-started/setup/self-managed/install-curl.mdx (new) — new page at slug /install/quick-install that renders the _quick_install snippet.
• core/get-started/setup/self-managed/clickhousectl.mdx (new) — new page at slug /install/clickhousectl that renders the _cli_install snippet, with a Windows/WSL note.
• core/get-started/setup/install.mdx — Quick install card now points at /install/quick-install and a new clickhousectl (CLI) card was added.
• products/cloud/features/cli.mdx — Local development link repointed to /install/clickhousectl.
• core/get-started/navigation.json — added the two new pages under the Self-managed group.

Context

• Upstream PR: Restore curl Quick install; move clickhousectl to its own page clickhouse-docs#6343
• i18n files in the source PR were skipped per migration guidance.
• The src/pages/index.mdx homepage button rename (ClickHouse CLI → ClickHouse Client) does not apply: the Mintlify homepage (index.mdx) doesn't expose that button.

Ambiguities / notes for review

• The existing core/get-started/setup/self-managed/quick-install.mdx has slug /getting-started/quick-start/oss — it actually mirrors Docusaurus getting-started/quick-start/oss.mdx, not install/quick-install.md. The filename is misleading but pre-existing. To avoid a filename collision, the new curl page was created as install-curl.mdx.
• The _cli_install.mdx snippet was not changed in upstream PR #6343 and is intentionally left untouched, even though its content has drifted from the upstream snippet in prior work.

---

Note

Low Risk
Documentation-only routing and content changes with no runtime or security impact.

Overview
Restores curl-based quick install as its own doc at /install/quick-install and adds a parallel clickhousectl install page at /install/clickhousectl, so local setup is documented as two first-class paths instead of folding everything into one route.

The Install hub gains a clickhousectl (CLI) card and points Quick install at /install/quick-install. Self-managed nav lists both new pages. _quick_install.mdx now documents that the curl script also installs clickhousectl (and chctl), adds CLICKHOUSE_ONLY=1 to skip the CLI, and fixes a typo. Cloud CLI local-development copy links to /install/clickhousectl.

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Project	Status	Preview	Updated (UTC)
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