feat(API): 카드 거래 등록/수정/삭제 API 추가

- CardTransactionService: store, update, destroy 메서드 추가
- CardTransactionController: store, update, destroy 메서드 추가
- routes/api.php: POST, PUT/{id}, DELETE/{id} 라우트 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -89,4 +89,51 @@ public function show(int $id): JsonResponse
             return $transaction;
         }, __('message.fetched'));
     }
+
+    /**
+     * 카드 거래 등록
+     */
+    public function store(Request $request): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($request) {
+            $validated = $request->validate([
+                'card_id' => 'nullable|integer|exists:cards,id',
+                'used_at' => 'required|date',
+                'merchant_name' => 'required|string|max:100',
+                'amount' => 'required|numeric|min:0',
+                'description' => 'nullable|string|max:500',
+                'account_code' => 'nullable|string|max:20',
+            ]);
+
+            return $this->service->store($validated);
+        }, __('message.created'));
+    }
+
+    /**
+     * 카드 거래 수정
+     */
+    public function update(Request $request, int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($request, $id) {
+            $validated = $request->validate([
+                'used_at' => 'nullable|date',
+                'merchant_name' => 'nullable|string|max:100',
+                'amount' => 'nullable|numeric|min:0',
+                'description' => 'nullable|string|max:500',
+                'account_code' => 'nullable|string|max:20',
+            ]);
+
+            return $this->service->update($id, $validated);
+        }, __('message.updated'));
+    }
+
+    /**
+     * 카드 거래 삭제
+     */
+    public function destroy(int $id): JsonResponse
+    {
+        return ApiResponse::handle(function () use ($id) {
+            return $this->service->destroy($id);
+        }, __('message.deleted'));
+    }
 }