Upgrade npm packages, removed unused github actions

[stasel]

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[Copilot]

Pull Request Overview

This PR upgrades several npm packages and updates GitHub Actions workflows while making a minor adjustment in the user controller.

• Upgraded express from v4.19.2 to v5.1.0
• Updated GitHub workflow configuration to use Node.js 24.x and newer action versions
• Adjusted the user extraction in the controller to use optional chaining

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
server/src/controllers/user.js	Changed user extraction from destructuring to optional chaining
server/package.json	Upgraded express to v5.1.0
.github/workflows/server-code-style-check.yml	Updated Node.js version and action versions
.github/workflows/client-code-style-check.yml	Updated Node.js version and action versions
.github/workflows-inactive/server-tests.yml	Updated Node.js version and action versions
.github/workflows-inactive/cypress-tests.yml	Updated checkout action version
.github/workflows-inactive/client-tests.yml	Updated Node.js version and action versions

Comments suppressed due to low confidence (1)

server/src/controllers/user.js:19

• Using optional chaining for req.body might result in user being undefined. Ensure that this change is intended, or consider providing a default value if downstream logic expects an object.

const user = req.body?.user;