✨ feat(Modules/Webstatement): Tambahkan BalanceSummaryRequest dan BalanceSummaryResource untuk API Balance Summary

- Menambahkan BalanceSummaryRequest dengan validasi lengkap untuk parameter API balance summary.
- Menambahkan BalanceSummaryResource untuk transformasi dan formatting response balance summary.
- Implementasi validasi nomor rekening menggunakan regex alphanumeric dan dash.
- Validasi tanggal dengan format Y-m-d dan batasan logika tanggal.
- Format balance menggunakan number_format dengan pemisah ribuan dan desimal Indonesia (2, ',', '.').
- Struktur response JSON yang konsisten dengan informasi lengkap balance summary.
- Menambahkan metadata pada response untuk tracking dan debugging.
- Logging request untuk monitoring dan audit trail.
- Mendukung pagination dan filtering tanggal untuk API balance summary.

app/Http/Resources/BalanceSummaryResource.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace Modules\Webstatement\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class BalanceSummaryResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @param  Request  $request
+     * @return array
+     */
+    public function toArray($request): array
+    {
+        return [
+            'account_number' => $this['account_number'],
+            'period' => [
+                'start_date' => $this['period']['start_date'],
+                'end_date' => $this['period']['end_date'],
+            ],
+            'opening_balance' => [
+                'date' => $this['opening_balance']['date'],
+                'balance' => $this['opening_balance']['balance'],
+                'formatted_balance' => number_format($this['opening_balance']['balance'], 2, ',', '.'),
+            ],
+            'closing_balance' => [
+                'date' => $this['closing_balance']['date'],
+                'balance' => $this['closing_balance']['balance'],
+                'formatted_balance' => number_format($this['closing_balance']['balance'], 2, ',', '.'),
+                'base_balance' => [
+                    'date' => $this['closing_balance']['base_balance']['date'],
+                    'balance' => $this['closing_balance']['base_balance']['balance'],
+                    'formatted_balance' => number_format($this['closing_balance']['base_balance']['balance'], 2, ',', '.'),
+                ],
+                'transactions_on_end_date' => $this['closing_balance']['transactions_on_end_date'],
+                'formatted_transactions_on_end_date' => number_format($this['closing_balance']['transactions_on_end_date'], 2, ',', '.'),
+            ],
+        ];
+    }
+
+    /**
+     * Get additional meta data.
+     *
+     * @param  Request  $request
+     * @return array
+     */
+    public function with($request): array
+    {
+        return [
+            'meta' => [
+                'account_number' => $this['account_number'],
+                'period' => [
+                    'start_date' => $this['period']['start_date'],
+                    'end_date' => $this['period']['end_date'],
+                ],
+                'generated_at' => now()->toDateTimeString(),
+            ],
+        ];
+    }
+}