Add Steinway & Lyngdorf virtual integration page

[fishloa]

Proposed change

Documentation page for the steinway_lyngdorf virtual integration.

The Steinway & Sons P100, P200 and P300 surround processors are made by
Lyngdorf and sold under the Steinway & Lyngdorf brand. They are supported by
the lyngdorf integration, and have been discoverable since the Steinway
Lyngdorf SSDP manufacturer string was added in home-assistant/core#181032, but
a user searching for the brand printed on their processor does not find
anything today.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase:
• Link to parent pull request in the Brands repository: Add Steinway & Lyngdorf brand images brands#11111
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

🔵 Needs a closer look

The new virtual integration page is missing the standard supported_brand include, so it doesn’t provide the expected setup and usage guidance for a virtual integration.

Pull request overview

Adds a new virtual integration documentation page so people searching for the Steinway & Lyngdorf brand are directed to the existing Lyngdorf integration that provides the actual device support.

Changes:

• Added steinway_lyngdorf virtual integration page front matter (domain, categories, platforms, supporting integration metadata).
• Added initial page content explaining the relationship to the Lyngdorf integration.

File summaries

File	Description
source/_integrations/steinway_lyngdorf.markdown	Introduces the virtual integration page metadata and initial content for Steinway & Lyngdorf.

Review details

Suppressed comments (1)

source/_integrations/steinway_lyngdorf.markdown:30

• This virtual integration page should use the shared supported_brand include so it provides consistent setup guidance (config flow snippet + usage information) like other virtual integrations (for example, source/_integrations/marantz.markdown:21 and source/_integrations/pge.markdown:21). As written, it only has a single sentence and misses the standard sections users expect.

The Steinway & Sons P100, P200, and P300 surround processors are made by Lyngdorf and are supported by the [Lyngdorf](/integrations/lyngdorf) {% term integration %}.

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[fishloa]

Merge order: this depends on home-assistant/brands#11111 for the brand images and home-assistant/core#181432 for the virtual integration itself. Both should land first.

[MartinHjelmare]

Thanks!