feat(API): 카드 거래 대시보드 API 신규 추가

- GET /api/v1/card-transactions/dashboard 엔드포인트 추가
- 월별 추이, 사용자별 비율, 최근 거래 목록 포함
- CEO 대시보드 cm1 모달용 데이터 제공

Co-Authored-By: Claude <noreply@anthropic.com>

routes/api.php

@@ -594,6 +594,7 @@
         Route::prefix('card-transactions')->group(function () {
             Route::get('', [CardTransactionController::class, 'index'])->name('v1.card-transactions.index');
             Route::get('/summary', [CardTransactionController::class, 'summary'])->name('v1.card-transactions.summary');
+            Route::get('/dashboard', [CardTransactionController::class, 'dashboard'])->name('v1.card-transactions.dashboard');
             Route::post('', [CardTransactionController::class, 'store'])->name('v1.card-transactions.store');
             Route::put('/bulk-update-account', [CardTransactionController::class, 'bulkUpdateAccountCode'])->name('v1.card-transactions.bulk-update-account');
             Route::get('/{id}', [CardTransactionController::class, 'show'])->whereNumber('id')->name('v1.card-transactions.show');
@@ -719,6 +720,7 @@
             Route::get('', [PurchaseController::class, 'index'])->name('v1.purchases.index');
             Route::post('', [PurchaseController::class, 'store'])->name('v1.purchases.store');
             Route::get('/summary', [PurchaseController::class, 'summary'])->name('v1.purchases.summary');
+            Route::get('/dashboard-detail', [PurchaseController::class, 'dashboardDetail'])->name('v1.purchases.dashboard-detail');
             Route::post('/bulk-update-type', [PurchaseController::class, 'bulkUpdatePurchaseType'])->name('v1.purchases.bulk-update-type');
             Route::post('/bulk-update-tax-received', [PurchaseController::class, 'bulkUpdateTaxReceived'])->name('v1.purchases.bulk-update-tax-received');
             Route::get('/{id}', [PurchaseController::class, 'show'])->whereNumber('id')->name('v1.purchases.show');