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/Services/Hosting/Contracts/AppInstallerInterface.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Services\Hosting\Contracts;
+
+use App\Models\HostedSite;
+use App\Models\AppInstallation;
+
+interface AppInstallerInterface
+{
+    public function getSupportedApps(): array;
+
+    public function getAppVersions(string $appType): array;
+
+    public function install(HostedSite $site, string $appType, array $config): AppInstallation;
+
+    public function uninstall(AppInstallation $installation): bool;
+
+    public function update(AppInstallation $installation, ?string $version = null): bool;
+
+    public function getStatus(AppInstallation $installation): array;
+
+    public function backup(AppInstallation $installation): string;
+
+    public function restore(AppInstallation $installation, string $backupPath): bool;
+}