Wire Ladill domain picker and purchase modal into servers flows.

Use the Domains API for owned domains across panel, account, and order forms, with an embedded iframe purchase modal instead of redirecting to domains.ladill.com.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Http/Controllers/OwnedDomainsController.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Services\Domains\LadillDomainsClient;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class OwnedDomainsController extends Controller
+{
+    public function __invoke(Request $request, LadillDomainsClient $domains): JsonResponse
+    {
+        $exclude = collect($request->query('exclude', []))
+            ->map(fn ($d) => strtolower(trim((string) $d)))
+            ->filter()
+            ->all();
+
+        $owned = collect($domains->ownedForUser((string) ladill_account()->public_id))
+            ->reject(fn ($d) => in_array($d, $exclude, true))
+            ->sort()
+            ->values()
+            ->all();
+
+        return response()->json(['data' => $owned]);
+    }
+}