Switch from SuperTokens to NextAuth.js

BREAKING CHANGE: Replace SuperTokens with NextAuth.js

Why:
- SuperTokens had persistent Traefik routing issues
- SSL certificate not issuing correctly
- Complex infrastructure (separate container)
- NextAuth runs in Next.js app (simpler, no separate service)

Changes:
- Install next-auth, @auth/prisma-adapter, prisma
- Create NextAuth API route: app/api/auth/[...nextauth]/route.ts
- Add Prisma schema for NextAuth tables (users, sessions, accounts)
- Update auth page to use NextAuth signIn()
- Remove all SuperTokens code and dependencies
- Keep same Google OAuth (just simpler integration)

Benefits:
- No separate auth service needed
- No Traefik routing issues
- Sessions stored in Montreal PostgreSQL
- Simpler configuration
- Battle-tested, widely used

All authentication data stays in Montreal!

Co-authored-by: Cursor <cursoragent@cursor.com>

app/components/NextAuthComponent.tsx

@@ -1,32 +1,20 @@
 "use client";
 
+import { signIn } from "next-auth/react";
 import { useState } from "react";
 import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
 
-export default function SuperTokensAuthComponent() {
+export default function NextAuthComponent() {
   const [isLoading, setIsLoading] = useState(false);
 
   const handleGoogleSignIn = async () => {
     setIsLoading(true);
     try {
-      // Get the base URL from environment or current window
-      const baseUrl = process.env.NEXT_PUBLIC_APP_URL || window.location.origin;
-      const redirectUri = `${baseUrl}/api/auth/callback/google`;
-      
-      // Get Google OAuth URL from SuperTokens
-      const response = await fetch(
-        `/api/auth/authorisationurl?thirdPartyId=google&redirectURIOnProviderDashboard=${encodeURIComponent(redirectUri)}`
-      );
-      const data = await response.json();
-      
-      if (data.status === "OK") {
-        // Redirect to Google OAuth
-        window.location.href = data.urlWithQueryParams;
-      } else {
-        console.error("Failed to get auth URL:", data);
-        setIsLoading(false);
-      }
+      // Sign in with Google using NextAuth
+      await signIn("google", {
+        callbackUrl: "/marks-account/projects",
+      });
     } catch (error) {
       console.error("Google sign-in error:", error);
       setIsLoading(false);

app/components/SuperTokensProvider.tsx

@@ -1,18 +0,0 @@
-"use client";
-
-import React from "react";
-import { useEffect } from "react";
-import SuperTokensReact from "supertokens-auth-react";
-import { frontendConfig } from "@/lib/supertokens/frontendConfig";
-
-export const SuperTokensProvider: React.FC<React.PropsWithChildren<{}>> = ({
-  children,
-}) => {
-  useEffect(() => {
-    if (typeof window !== "undefined") {
-      SuperTokensReact.init(frontendConfig());
-    }
-  }, []);
-
-  return <>{children}</>;
-};