Add requireSetupIncompleteOrAdmin and adjust routes

Introduce a new middleware requireSetupIncompleteOrAdmin that allows unauthenticated access while the setup wizard is in progress but enforces admin authentication once setup is complete. Replace requireSetupIncomplete with the new guard in test-paths, test-abs and test-oidc API routes. Update the front-end hook to use fetchWithAuth for authenticated requests. Revise setup-guard tests to cover the new semantics: shared endpoints now return 401 when setup is complete and no auth is provided, return 403 for authenticated non-admin users, and allow admin access or unauthenticated access during setup/DB-unready conditions; also add jwt verification and user lookup mocks to the tests.

src/app/api/setup/test-abs/route.ts

@@ -4,10 +4,10 @@
  */
 
 import { NextRequest, NextResponse } from 'next/server';
-import { requireSetupIncomplete } from '@/lib/middleware/auth';
+import { requireSetupIncompleteOrAdmin } from '@/lib/middleware/auth';
 
 export async function POST(request: NextRequest) {
-  return requireSetupIncomplete(request, async (req) => {
+  return requireSetupIncompleteOrAdmin(request, async (req) => {
   try {
     const { serverUrl, apiToken } = await req.json();