✨ feat(api): menambahkan controller API untuk ringkasan saldo rekening

- Menambahkan `AccountBalanceController` dengan endpoint `GET /api/balance`.
- Integrasi dengan `AccountBalanceService` untuk pengelolaan logika bisnis.
- Validasi request menggunakan `BalanceSummaryRequest`.
- Formatting response dengan `BalanceSummaryResource`.
- Menyediakan ringkasan saldo, transaksi, dan metadata dengan response JSON konsisten.

app/Http/Controllers/Api/AccountBalanceController.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace Modules\Webstatement\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Support\Facades\Log;
+use Modules\Webstatement\Http\Requests\BalanceSummaryRequest;
+use Modules\Webstatement\Http\Requests\DetailedBalanceRequest;
+use Modules\Webstatement\Services\AccountBalanceService;
+use Modules\Webstatement\Http\Resources\BalanceSummaryResource;
+use Modules\Webstatement\Http\Resources\DetailedBalanceResource;
+use Exception;
+
+class AccountBalanceController extends Controller
+{
+    protected AccountBalanceService $accountBalanceService;
+
+    public function __construct(AccountBalanceService $accountBalanceService)
+    {
+        $this->accountBalanceService = $accountBalanceService;
+    }
+
+    /**
+     * Get account balance summary (opening and closing balance)
+     *
+     * @param BalanceSummaryRequest $request
+     * @return JsonResponse
+     */
+    public function getBalanceSummary(BalanceSummaryRequest $request): JsonResponse
+    {
+        try {
+
+            $accountNumber = $request->input('account_number');
+            $startDate = $request->input('start_date');
+            $endDate = $request->input('end_date');
+
+            Log::info('Account balance summary requested', [
+                'account_number' => $accountNumber,
+                'start_date' => $startDate,
+                'end_date' => $endDate,
+                'ip' => $request->ip(),
+                'user_agent' => $request->userAgent()
+            ]);
+
+            $result = $this->accountBalanceService->getBalanceSummary(
+                $accountNumber,
+                $startDate,
+                $endDate
+            );
+
+            return (new BalanceSummaryResource($result))->response();
+
+        } catch (Exception $e) {
+            Log::error('Error getting account balance summary', [
+                'error' => $e->getMessage(),
+                'file' => $e->getFile(),
+                'line' => $e->getLine(),
+                'trace' => $e->getTraceAsString()
+            ]);
+
+            return response()->json([
+                'success' => false,
+                'message' => 'Terjadi kesalahan saat mengambil data saldo',
+                'error' => config('app.debug') ? $e->getMessage() : null
+            ], 500);
+        }
+    }
+}