fix: remove hardcoded vite prefix

Closes #1

Author: Julien-R44

src/contracts/index.ts

@@ -4,7 +4,7 @@ import type { ValidateFn } from '@poppinss/validator-lite'
 /**
  * Schema defined by the user
  */
-export type RecordViteKeys<T> = Record<`VITE_${string}`, T>
+export type RecordViteKeys<T> = Record<`${string}_${string}`, T>
 
 /**
  * Options that can be passed to the plugin