docs: Add OpenRouter app identification headers documentation

[continue]

Summary

PR #11991 (merged 2026-04-02) and PR #11857 added automatic app identification headers to OpenRouter requests:

• HTTP-Referer: https://www.continue.dev/
• X-OpenRouter-Title: Continue
• X-OpenRouter-Categories: ide-extension

Issue #11923 was previously opened for this but was closed without the documentation actually being added to the docs.

Documentation Needed

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

1. App Identification section: Explain that Continue automatically sends identification headers to OpenRouter
2. Dashboard visibility: Mention that users can see their Continue usage in OpenRouter's activity dashboard under the "Continue" app name
3. Override capability: Note that custom headers in requestOptions.headers can override these defaults if needed

Suggested Addition

Add a new section to the OpenRouter docs:

## App Identification

Continue automatically sends identification headers with all OpenRouter requests:
- `HTTP-Referer: https://www.continue.dev/`
- `X-OpenRouter-Title: Continue`
- `X-OpenRouter-Categories: ide-extension`

These headers help identify Continue in [OpenRouter's activity dashboard](https://openrouter.ai/activity) and App Showcase. Your usage will appear under the "Continue" app.

If needed, you can override these headers using `requestOptions.headers` in your configuration.

Related PRs

• feat(openrouter): send HTTP-Referer and X-Title headers in core/llm OpenRouter class #11991: feat(openrouter): send HTTP-Referer and X-Title headers in core/llm OpenRouter class
• 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
• Previous closed issue: Documentation: Add OpenRouter HTTP-Referer and X-Title headers info #11923

---

Generated with Continue

Co-Authored-By: Continue noreply@continue.dev
Co-authored-by: bekahhw rhawrot@gmail.com