Implement email change

lib/server/validation/userEmailChangeSchemas.ts

@@ -0,0 +1,15 @@
+import { z } from "zod";
+
+/** POST `/api/user/email-change/request` body (CR-103). */
+export const emailChangeRequestBodySchema = z.object({
+  newEmail: z
+    .string()
+    .trim()
+    .min(1, "Email is required")
+    .transform((s) => s.toLowerCase())
+    .pipe(z.string().email({ message: "Valid email required" })),
+});
+
+export type EmailChangeRequestBody = z.infer<
+  typeof emailChangeRequestBodySchema
+>;