feat(api): add user search endpoint and normalize response data and validation

src/lib/auth/register.ts

@@ -1,8 +1,8 @@
 'use server';
 
-import type { z } from 'zod';
+import type { z } from 'zod/v4';
 import bcrypt from 'bcryptjs';
-import { disallowedUsernames, registerSchema } from '@/lib/validation/user';
+import { registerSchema } from '@/lib/validation/user';
 import { prisma } from '@/prisma';
 
 export async function registerAction(data: z.infer<typeof registerSchema>) {
@@ -11,39 +11,12 @@ export async function registerAction(data: z.infer<typeof registerSchema>) {
 
     if (!result.success) {
       return {
-        error: result.error.errors[0].message,
+        error: result.error.issues[0].message,
       };
     }
 
     const { email, password, firstName, lastName, username } = result.data;
 
-    const user = await prisma.user.findUnique({
-      where: {
-        email,
-      },
-    });
-
-    if (user) {
-      return {
-        error: 'User already exist with this email',
-      };
-    }
-
-    const existingUsername = await prisma.user.findUnique({
-      where: {
-        name: username,
-      },
-    });
-
-    if (
-      existingUsername ||
-      disallowedUsernames.includes(username.toLowerCase())
-    ) {
-      return {
-        error: 'Username already exists',
-      };
-    }
-
     const passwordHash = await bcrypt.hash(password, 10);
 
     await prisma.$transaction(async (tx) => {