Initial Ladill Hosting app with Gitea deploy pipeline.

Shared web hosting extracted from the platform monolith, with CI deploy
to /var/www/ladill-hosting matching Bird/Domains/Email.

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

app/Http/Controllers/Hosting/MailboxLinkBannerController.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Http\Controllers\Hosting;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+
+class MailboxLinkBannerController extends Controller
+{
+    public function dismiss(Request $request): RedirectResponse
+    {
+        $request->session()->put('mailbox_link_banner_dismissed', true);
+
+        return back();
+    }
+}