Remove app/Space folder and extract model business logic into services

Relocate all 14 files from the catch-all app/Space namespace into proper
locations: data providers to Support/Formatters, installation utilities to
Services/Installation, PDF utils to Services/Pdf, module/update classes to
Services/Module and Services/Update, SiteApi trait to Traits, and helpers
to Support.

Extract ~1,400 lines of business logic from 8 fat models (Invoice, Payment,
Estimate, RecurringInvoice, Company, Customer, Expense, User) into 9 new
service classes with constructor injection. Controllers now depend on
services instead of calling static model methods. Shared item/tax creation
logic consolidated into DocumentItemService.

routes/console.php

@@ -2,7 +2,8 @@
 
 use App\Models\CompanySetting;
 use App\Models\RecurringInvoice;
-use App\Space\InstallUtils;
+use App\Services\Installation\InstallUtils;
+use App\Services\RecurringInvoiceService;
 use Illuminate\Support\Facades\Schedule;
 
 // Only run in demo environment
@@ -25,7 +26,7 @@ if (InstallUtils::isDbCreated()) {
         $timeZone = CompanySetting::getSetting('time_zone', $recurringInvoice->company_id);
 
         Schedule::call(function () use ($recurringInvoice) {
-            $recurringInvoice->generateInvoice();
+            app(RecurringInvoiceService::class)->generateInvoice($recurringInvoice);
         })->cron($recurringInvoice->frequency)->timezone($timeZone);
     }
 }