Add database readiness check and setup redirect

app/Http/Middleware/EnsureDatabaseReady.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
+use Symfony\Component\HttpFoundation\Response;
+
+class EnsureDatabaseReady
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        if ($request->is('setup*')) {
+            return $next($request);
+        }
+
+        try {
+            DB::connection()->getPdo();
+        } catch (\Throwable $e) {
+            return redirect()->route('setup.index')
+                ->withErrors(['db' => 'Database belum dikonfigurasi. Silakan lengkapi pengaturan DB & migrate sebelum melanjutkan.']);
+        }
+
+        return $next($request);
+    }
+}