docs(get-started): add Route your first LLM request tutorial

[khushalsonawat]

Summary

Adds the Route your first LLM request tutorial (Get Started → Bring your data in), the second first-run page.

Stacked PR — base is docs/get-started-revamp (#679), not dev. Merge #679 first; this will retarget to dev automatically once the base lands.

Changes

• New page src/pages/docs/get-started/route-your-first-llm-request.mdx: route an OpenAI SDK call through Agent Command Center by changing base_url + api_key (Python and JS/TS), confirm via x-agentcc-* response headers, and switch providers by changing the model name.

Notes / follow-ups

• Screenshots (API Keys page, dashboard request view) are TODO, marked with {/* TODO */} comments — will be added once captured.

Testing

• pnpm dev: page renders (HTTP 200); the "Route your first LLM request" sidebar item resolves; links to routing / guardrails / providers all resolve.

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