fix(oobe): add test connection endpoint and fix EOF newline (GRO-392)

- Add POST /api/setup/auth-provider/test endpoint for OOBE test connection
- Guard with same !superUser check as bootstrap endpoint
- Update SetupWizard to call /api/setup/auth-provider/test instead of
  /api/admin/auth-provider/test (which requires auth session)
- Add trailing newline at EOF in setup.ts

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/src/pages/SetupWizard.jsx

@@ -82,7 +82,7 @@ export function SetupWizard() {
     setTestingConnection(true);
     setTestResult(null);
     try {
-      const res = await fetch("/api/admin/auth-provider/test", {
+      const res = await fetch("/api/setup/auth-provider/test", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({