Add cURL to Fetch to API Tools and Testing

[nick-alltoolsverse]

Description

Adds cURL to Fetch to API Tools and Testing. It converts cURL requests into browser Fetch, TypeScript, Axios, or node-fetch code locally in the browser.

I tested the live sample with a POST request, JSON body, and Bearer authorization. The generated Fetch code preserved the method, headers, and JSON body correctly.

Type of change

• Add a new resource
• Update an existing resource
• Fix formatting/typos
• Improve categorization

Checklist

• I have read contributing.md.
• My change is specifically relevant to developer essentials.
• I used the format [Name](URL) - Description. for list entries.
• I checked for duplicate entries.
• Descriptions are concise, objective, and end with a period.
• I verified links are valid and not broken.
• I used canonical HTTPS URLs without shorteners or tracking parameters.
• I disclosed any affiliation with the added/updated resource.
• This pull request contains a single logical change.

Additional context

Affiliation: I build and operate All Tools Verse.

Assistance disclosure: Codex helped research the repository rules, test the live tool, prepare the one-line entry, and validate the pull request.

[CLAassistant]

All committers have signed the CLA.