refactor(SW-898): replace signup server action with TRPC

server/routers/user/input.ts

@@ -1,5 +1,9 @@
 import { z } from "zod"
 
+import { Lang } from "@/constants/languages"
+
+import { signUpSchema } from "@/components/Forms/Signup/schema"
+
 // Query
 export const staysInput = z
   .object({
@@ -35,3 +39,7 @@ export const saveCreditCardInput = z.object({
   transactionId: z.string(),
   merchantId: z.string().optional(),
 })
+
+export const signupInput = signUpSchema.extend({
+  language: z.nativeEnum(Lang),
+})