feat(auth): add NextAuth.js with credentials provider

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/components/providers/auth-provider.tsx

@@ -0,0 +1,14 @@
+'use client';
+
+import { SessionProvider } from 'next-auth/react';
+import { ReactNode } from 'react';
+
+interface AuthProviderProps {
+  children: ReactNode;
+}
+
+export function AuthProvider({ children }: AuthProviderProps) {
+  return <SessionProvider>{children}</SessionProvider>;
+}
+
+export default AuthProvider;