feat(Requesty Node): Add Requesty Chat Model node

[Thibault00]

Summary

Add a new Requesty Chat Model node, allowing users to connect AI Agents to any model via Requesty — an OpenAI-compatible AI router (similar to OpenRouter).

What's included:

• RequestyApi credential (API key + base URL https://router.requesty.ai/v1)
• LmChatRequesty node with dynamic model loading from /models endpoint
• Fetch wrapper to normalize empty tool call arguments from proxied Anthropic models
• Light/dark SVG icons
• 22 unit tests covering node config, options passthrough, response format, and the fetch wrapper

The node uses ChatOpenAI from LangChain under the hood since Requesty exposes an OpenAI-compatible API. Architecture mirrors the existing OpenRouter Chat Model node.

How to test:

1. pnpm dev and open http://localhost:5678
2. Go to Settings > Credentials > Add Credential > search "Requesty"
3. Enter your Requesty API key
4. Create a workflow: AI Agent → attach Requesty Chat Model
5. Select a model from the dropdown and run

Related Linear tickets, Github issues, and Community forum posts

N/A — new integration, no prior ticket.

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[CLAassistant]

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[n8n-assistant]

Hey @Thibault00,

Thank you for your contribution. We appreciate the time and effort you’ve taken to submit this pull request.

Before we can proceed, please ensure the following:
• Tests are included for any new functionality, logic changes or bug fixes.
• The PR aligns with our contribution guidelines.

Regarding new nodes:
We no longer accept new nodes directly into the core codebase. Instead, we encourage contributors to follow our Community Node Submission Guide to publish nodes independently.

If your node integrates with an AI service that you own or represent, please email nodes@n8n.io and we will be happy to discuss the best approach.

About review timelines:
This PR has been added to our internal tracker as "GHC-7079". While we plan to review it, we are currently unable to provide an exact timeframe. Our goal is to begin reviews within a month, but this may change depending on team priorities. We will reach out when the review begins.

Thank you again for contributing to n8n.

[Thibault00]

See community notes:
https://community.n8n.io/t/please-add-support-of-ai-router-service-requesty/142931
https://community.n8n.io/t/add-requesty-as-llm-provider/102924