feat(insomnia): set max_token in AI settings

[juliamrch]

Description

This PR updates the Insomnia AI and MCP pages to include the max_tokens settings, which can be used to limit the number of tokens used per request.

closes #5830

Preview Links

/insomnia/ai-in-insomnia/#frequently-asked-questions

/insomnia/mcp-clients-in-insomnia/

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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