admin Jobs tab: show job controls above the pipeline readiness table

The 500+ row readiness table forced scrolling past it to reach the actual job
controls. Put JobControls first, readiness below.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/pages/AdminPage.tsx

@@ -41,8 +41,8 @@ export default function AdminPage() {
         )}
         {activeTab === 'Jobs' && (
           <div className="space-y-4">
-            <PipelineReadinessPanel />
             <JobControls />
+            <PipelineReadinessPanel />
           </div>
         )}
         {activeTab === 'Cleanup' && <DataCleanup />}