add frontend format support for currencies, add currencies endpoint

app/Http/Controllers/Api/V1/CurrencyController.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Controller;
+use App\Service\CurrencyService;
+use Brick\Money\ISOCurrencyProvider;
+use Illuminate\Http\JsonResponse;
+
+class CurrencyController extends Controller
+{
+    /**
+     * Get all currencies
+     *
+     * @response array{code: string, name: string, symbol: string}[]
+     * @operationId getCurrencies
+     */
+    public function index(): JsonResponse
+    {
+        $currencyService = app(CurrencyService::class);
+
+        $currencies = array_values(array_map(
+            fn ($currency) => [
+                'code' => $currency->getCurrencyCode(),
+                'name' => $currency->getName(),
+                'symbol' => $currencyService->getCurrencySymbol($currency->getCurrencyCode()),
+                ],
+            ISOCurrencyProvider::getInstance()->getAvailableCurrencies()
+        ));
+
+        return response()->json($currencies);
+    }
+}