generated trpc have input of unknown with zod v4

[nickwang0808]

Description and expected behavior
testing on the demo repo https://github.com/zenstackhq/sample-todo-trpc,
if you change zod version in package.json to v4, and npm i && npx zenstack generated, the generated trpc procs all have input of unknown, v3 works as expected

Screenshots
If applicable, add screenshots to help explain your problem.

[ymc9]

Hi @nickwang0808 , I've made a change in v2.21.0 to generate zod schemas according to zod v3's typing. This can be changed by using the new "version" option in the "@core/zod" plugin config, if you want to target v4 instead. It doesn't matter which version of Zod you install, as long as it satisfies the peer dependency version requirement.

https://zenstack.dev/docs/reference/plugins/zod#options