Update and restructure SQL Server integration docs

[alistairmatthews]

The existing SQL Server integration document is comprehensive but difficult for beginners. This PR is intended to keep the comprehensive information but make it easier for those who want to get going quickly. I've used Copilot to propagate changes from the new PostgreSQL documents to the SQL Server ones.

This PR:

• Splits the large integration doc into two: Hosting and Client.
• Adds a getting started short tutorial.
• Adds a Properties of the PostgreSQL resources section to the client reference docs. This describes what configuration values are injected by the WithReference() method.

[Copilot]

Pull request overview

This PR restructures the SQL Server integration documentation to improve accessibility for beginners while maintaining comprehensive information. The changes align the SQL Server docs with the existing PostgreSQL documentation structure, splitting a single large file into multiple focused documents.

• Splits monolithic SQL Server integration doc into separate Hosting and Client integration references
• Adds a beginner-friendly getting started guide with examples for C#, Python, and JavaScript
• Adds "Properties of the SQL Server resources" section documenting environment variables and connection properties

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
sql-server-host.mdx	New hosting integration reference covering SQL Server resource creation, database scripts, data persistence, and container configuration
sql-server-get-started.mdx	New getting started tutorial with multi-language examples (C#, Python, JavaScript) for quickly implementing SQL Server integrations
sql-server-client.mdx	New client integration reference documenting connection setup, keyed services, configuration options, and observability features
sql-server-extensions.mdx	Updated links to reflect new file structure and navigation paths
sidebar.topics.ts	Updated navigation structure to match PostgreSQL's four-section layout (Get started, Hosting, Client, Extensions)
sql-server.mdx	Deleted original monolithic integration document

Comments suppressed due to low confidence (1)

src/frontend/src/content/docs/integrations/databases/sql-server/sql-server-extensions.mdx:97

• The relative path to the integrations overview is incorrect. From the sql-server subdirectory, "../overview.md" would resolve to "databases/overview.md" which doesn't exist. The correct path should be "../../overview.md" to go up two levels from sql-server/ to integrations/.

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