chore: replace live-server with Vite, bump deps, remove stale test libs, add .nvmrc

[lmken]

Summary

Addresses SE-1055 through SE-1059. Branched off #51 to layer on top of those dependency bumps.

• SE-1055 — Replace unmaintained live-server with Vite 7.3.1 in moonpay-websdk-buy and moonpay-websdk-sell. Adds vite.config.js to each project (port 8080, auto-open). Updates root build script to include both WebSDK projects. Eliminates all live-server audit vulnerabilities and makes the WebSDK projects consistent with the 4 React projects.
• SE-1056 — Bump dotenv 16.4.5 → 17.3.1 in server/.
• SE-1057 — Bump web3 4.13.0 → 4.16.0 in hosted-wallet-page/.
• SE-1058 — Remove @testing-library/jest-dom, @testing-library/react, and @testing-library/user-event from all 4 React projects. No test files exist in the repo — these were CRA scaffolding leftovers.
• SE-1059 — Add .nvmrc (Node 20) to repo root.

Test plan

• npm install completes cleanly
• npm run build succeeds for all 6 projects (4 React + 2 WebSDK)
• npm start --workspace=moonpay-websdk-buy serves on port 8080
• npm start --workspace=moonpay-websdk-sell serves on port 8080
• npm start --workspace=server starts the signing server
• npm audit shows only the 2 false-positive name-squatting alerts (unfixable)

Closes #53, #54, #55, #56, #57

🤖 Generated with Claude Code

[linear]

SE-1055 Replace unmaintained live-server with maintained alternative

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	dotenv@​16.4.5 ⏵ 17.3.1			+1

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		License policy violation: npm web3 Location: Package overview From: package-lock.json → npm/web3@4.16.0 ℹ Read more on: This package | This alert | What is a license policy violation? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Find a package that does not violate your license policy or adjust your policy to allow this package's license. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/web3@4.16.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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