refactor(services): move Updater to app/Support/Update

Updater is a pure static procedural class — all eight public methods (checkForUpdate, download, unzip, copyFiles, deleteFiles, cleanStaleFiles, migrateUpdate, finishUpdate) are static, there's no constructor, no DI, no instance state. It's stateless self-update plumbing, same character as the Setup/ helpers that moved to Support/ in commit 6d1816bd.

Moving it out of Services/ leaves Services/ exclusively for DI-injected classes with real business logic, which is the contract the reorg was aiming for. Update/ now lives next to Setup/ in Support/ where the other install/upgrade-time utilities live.

Only 3 consumers needed touching: UpdateController, UpdateCommand, and a reference in config/invoiceshelf.php's comment. 350 tests still pass.

app/Console/Commands/UpdateCommand.php

@@ -2,7 +2,7 @@
 
 namespace App\Console\Commands;
 
-use App\Services\Update\Updater;
+use App\Support\Update\Updater;
 use Illuminate\Console\Command;
 use Illuminate\Support\Facades\File;
 

app/Http/Controllers/Admin/UpdateController.php

@@ -3,7 +3,7 @@
 namespace App\Http\Controllers\Admin;
 
 use App\Http\Controllers\Controller;
-use App\Services\Update\Updater;
+use App\Support\Update\Updater;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\File;

app/Support/Update/Updater.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace App\Services\Update;
+namespace App\Support\Update;
 
 use App\Events\UpdateFinished;
 use App\Models\Setting;

config/invoiceshelf.php

@@ -45,7 +45,7 @@ return [
     * Marketplace and updater base URL.
     *
     * The marketplace client (App\Services\Module\ModuleInstaller) and the
-    * updater (App\Services\Update\Updater) both build their HTTP client base
+    * updater (App\Support\Update\Updater) both build their HTTP client base
     * URI from this value via App\Traits\SiteApi::getRemote(). Override via
     * INVOICESHELF_BASE_URL in .env to point a self-hosted instance or local
     * dev environment at a non-production marketplace (e.g. a local checkout