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.

app/Http/Controllers/V1/Admin/Expense/ExpensesController.php

@@ -7,11 +7,16 @@ use App\Http\Requests\DeleteExpensesRequest;
 use App\Http\Requests\ExpenseRequest;
 use App\Http\Resources\ExpenseResource;
 use App\Models\Expense;
+use App\Services\ExpenseService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 
 class ExpensesController extends Controller
 {
+    public function __construct(
+        private readonly ExpenseService $expenseService,
+    ) {}
+
     /**
      * Display a listing of the resource.
      *
@@ -46,7 +51,7 @@ class ExpensesController extends Controller
     {
         $this->authorize('create', Expense::class);
 
-        $expense = Expense::createExpense($request);
+        $expense = $this->expenseService->create($request);
 
         return new ExpenseResource($expense);
     }
@@ -72,7 +77,7 @@ class ExpensesController extends Controller
     {
         $this->authorize('update', $expense);
 
-        $expense->updateExpense($request);
+        $this->expenseService->update($expense, $request);
 
         return new ExpenseResource($expense);
     }