[proof of concept] server-side signing

[jakehobbs]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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• Did you follow the contribution guidelines?

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PR-Codex overview

This PR introduces a server-side implementation for an embedded accounts system using the Account Kit SDK, enhancing user authentication and API key management.

Detailed summary

• Added .gitignore for temp-data.
• Created next.config.mjs and postcss.config.mjs for configuration.
• Introduced environment variables in .env.example.
• Defined tailwind.config.ts for styling.
• Implemented user data management in db.ts.
• Added API routes for signing and transaction handling.
• Updated README.md with setup instructions.
• Enhanced package.json with dependencies for Account Kit and React Query.

The following files were skipped due to too many changes: examples/embedded-accounts-server-side-eoa/yarn.lock, examples/embedded-accounts-server-side-eoa/package-lock.json

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 27, 2025 7:19am
aa-sdk-ui-demo	❌ Failed (Inspect)			Mar 27, 2025 7:19am

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