docs: add pompelmi to additional middleware modules

[SonoTommy]

Summary

This PR adds pompelmi to the “Additional middleware modules” section in en/resources/middleware.md.

Pompelmi is an open-source file upload security toolkit for Node.js with Express support. It helps inspect uploaded files before storage with checks such as malware scanning hooks, MIME spoofing detection, and risky archive inspection.

Why this fits this page

• It is directly relevant to Express middleware usage around multipart/form-data and file uploads.
• It addresses a practical security concern at the middleware layer: validating and scanning untrusted uploads before they are stored or processed.
• The project already documents Express usage and provides an Express adapter for this workflow.

Scope

• docs only
• one new entry in the third-party middleware list
• no changes to Express core or official Express-maintained middleware

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[Copilot]

Pull request overview

Adds the pompelmi project to the community-maintained “Additional middleware modules” list in the Express documentation, expanding the set of third-party middleware options (specifically for securing file uploads).

Changes:

• Added a new table entry linking to pompelmi/pompelmi.
• Included a short description highlighting upload security checks (malware hooks, MIME spoofing detection, risky archive inspection).

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[bjohansebas]

Thanks, but for now we’re not accepting any additional middlewares beyond those maintained by Express and the third-party ones we already include. In the future, I’d like to reevaluate the process for including third-party middlewares, but we’re currently in the middle of a redesign, so it’s not something we can focus on right now.