#494 docs: add deno dx examples

Hello,

This PR introduces Deno DX running method that's got introduced in Deno v2.6

https://deno.com/blog/v2.6

Can confirm it works nicely, so I simply wanted to add a tiny note about this on README.

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Summary by cubic

Add Deno v2.6 DX run option to the docs, showing dx tokscale@latest as an alternative to npx and bunx across README files (EN, JA, KO, ZH-CN).