feat: add Auth.js authentication with email verification and login/register forms

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/lib/validations/auth.ts

@@ -0,0 +1,32 @@
+import { z } from "zod"
+
+// Anchored exactly to @appisoftsas.com — no subdomains/suffixes
+// (e.g. user@appisoftsas.com.evil.com must be rejected).
+const APPISOFT_EMAIL_REGEX = /^[^@\s]+@appisoftsas\.com$/i
+
+export const registerSchema = z
+  .object({
+    email: z
+      .string()
+      .min(1, "El correo es obligatorio")
+      .regex(APPISOFT_EMAIL_REGEX, "Debe usar un correo @appisoftsas.com"),
+    displayName: z
+      .string()
+      .min(2, "El nombre debe tener al menos 2 caracteres")
+      .max(100, "El nombre es demasiado largo"),
+    password: z.string().min(8, "La contraseña debe tener al menos 8 caracteres"),
+    confirmPassword: z.string().min(1, "Confirma tu contraseña"),
+  })
+  .refine((data) => data.password === data.confirmPassword, {
+    message: "Las contraseñas no coinciden",
+    path: ["confirmPassword"],
+  })
+
+export type RegisterInput = z.infer<typeof registerSchema>
+
+export const loginSchema = z.object({
+  email: z.string().min(1, "El correo es obligatorio"),
+  password: z.string().min(1, "La contraseña es obligatoria"),
+})
+
+export type LoginInput = z.infer<typeof loginSchema>