docs: add Lanseq as supported provider

[CHYYX]

Description

Adds Lanseq to the supported LLM provider table.

Lanseq exposes an OpenAI-compatible API at /v1 using API key authentication, so it works with Agent Router through the existing OpenAI schema support without requiring a new translator or provider-specific code path.

Validation

Validated against the live Lanseq endpoint using Agent Router:

• OpenAI-compatible /v1 endpoint
• API key authentication
• successful routed chat completion
• model: qwen3.8-27b-int4
• HTTP 200 response
• completion usage returned by the upstream

Lanseq API documentation:
https://api.lanseq.cloud/docs

git diff --check passes.

The repository's full local precommit suite was not completed because the validation environment did not have the repository-required Go 1.27.1 toolchain available. Upstream CI is therefore left to perform the repository-standard checks.

Scope

Documentation-only change. No routing, translator, authentication, or runtime code is modified.

AI assistance

AI assistance was used while preparing and reviewing this contribution. The submitted change and validation results were reviewed by the contributor.

[netlify]

✅ Deploy Preview for theagentrouter canceled.

Name	Link
🔨 Latest commit	e3fafa6
🔍 Latest deploy log	https://app.netlify.com/projects/theagentrouter/deploys/6ac45891b21bb00008dd6658

[aabchoo]

Could you update your current commits to be signed based on the expected format? That should pass the DCO rule!