Align backend plan with codebase

app/api/auth/session/route.ts

@@ -0,0 +1,19 @@
+import { NextResponse } from "next/server";
+import { isDatabaseConfigured } from "../../../../lib/server/env";
+import { dbUnavailable } from "../../../../lib/server/responses";
+import { getSessionUser } from "../../../../lib/server/session";
+
+export async function GET() {
+  if (!isDatabaseConfigured()) {
+    return dbUnavailable();
+  }
+
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ user: null });
+  }
+
+  return NextResponse.json({
+    user: { id: user.id, email: user.email },
+  });
+}