Documentation: Add OpenRouter HTTP-Referer and X-Title headers info

[continue]

Summary

PR #11857 added automatic HTTP-Referer and X-Title headers to all OpenRouter API requests. This feature helps identify Continue in OpenRouter's activity dashboard and App Showcase.

Details

• Continue now sends HTTP-Referer: https://www.continue.dev/ and X-Title: Continue headers to all OpenRouter API requests
• User-configured headers in requestOptions.headers can override these defaults
• This identifies Continue in OpenRouter's activity dashboard

Documentation needed

The OpenRouter provider documentation at docs/customize/model-providers/top-level/openrouter.mdx should be updated to mention:

1. That Continue automatically sends app identification headers to OpenRouter
2. How users can see their Continue usage in OpenRouter's dashboard
3. That custom headers can override these if needed

Related

• PR feat(openrouter): send HTTP-Referer and X-Title headers to identify app #11857: feat(openrouter): send HTTP-Referer and X-Title headers to identify app
• Closes OpenRouter: send additional headers to identify app #4049

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Co-Authored-By: Continue noreply@continue.dev