feat: add functional authentication

spec/schemas/email.ts

@@ -0,0 +1,11 @@
+import z from "zod";
+
+export const EmailSchema = z.object({
+  type: z.enum(["personal", "work"]).describe("The context of the email address, e.g., personal or work."),
+  value: z.email().describe("A valid email address string."),
+  primary: z.boolean().describe("Indicates if this is the primary email."),
+  verified: z.boolean().describe("True if the email address has been verified."),
+  label: z.string().optional().describe("Optional display label for the email address."),
+});
+
+export type Email = z.infer<typeof EmailSchema>;