Fix all NextAuth v4 imports across codebase

lib/auth-actions.ts

@@ -3,7 +3,7 @@
 import { prisma } from './db'
 import bcrypt from 'bcryptjs'
 import { z } from 'zod'
-import { signIn, signOut } from '@/auth'
+import { signIn, signOut } from 'next-auth/react'
 import { checkRateLimit, resetRateLimit, LOGIN_RATE_LIMIT, REGISTER_RATE_LIMIT } from './rate-limit'
 import { headers } from 'next/headers'
 import { getClientIdentifier } from './rate-limit'
@@ -196,7 +196,7 @@ export async function logoutUser(): Promise<void> {
 export async function getCurrentSession() {
   try {
     const { auth } = await import('@/auth')
-    const session = await auth()
+    const session = await getServerSession(authOptions)
     return session
   } catch (error) {
     console.error('Session retrieval error:', error)