Migrate to bun with railpack

[LukeHagar]

Migrate the project to use Bun as its package manager and runtime to enable Railpack integration.

The SvelteKit adapter was switched to @sveltejs/adapter-node for reliable runtime support with Bun. The package.json scripts and engines were updated for Bun, and a start:railpack alias was added. The pnpm-lock.yaml was removed and bun.lockb was generated.

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[cursor]

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✨ Finishing touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch cursor/migrate-to-bun-with-railpack-ec6e

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