feat: 수주관리(Order Management) API Phase 1.1 구현

- OrderService 구현 (index, stats, show, store, update, destroy, updateStatus)
- OrderController 구현 (7개 API 엔드포인트)
- FormRequest 클래스 3개 생성 (Store, Update, UpdateStatus)
- 상태 전환 규칙 검증 (DRAFT → CONFIRMED → IN_PROGRESS → COMPLETED/CANCELLED)
- 수주번호 자동 생성 (ORD{YYYYMMDD}{0001} 형식)
- Swagger API 문서 작성 (OrderApi.php)
- i18n 메시지 키 추가 (ko/en)

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

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

@@ -0,0 +1,88 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Helpers\ApiResponse;
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Order\StoreOrderRequest;
+use App\Http\Requests\Order\UpdateOrderRequest;
+use App\Http\Requests\Order\UpdateOrderStatusRequest;
+use App\Services\OrderService;
+use Illuminate\Http\Request;
+
+class OrderController extends Controller
+{
+    public function __construct(private OrderService $service) {}
+
+    /**
+     * 목록 조회
+     */
+    public function index(Request $request)
+    {
+        return ApiResponse::handle(function () use ($request) {
+            return $this->service->index($request->all());
+        }, __('message.order.fetched'));
+    }
+
+    /**
+     * 통계 조회
+     */
+    public function stats()
+    {
+        return ApiResponse::handle(function () {
+            return $this->service->stats();
+        }, __('message.order.fetched'));
+    }
+
+    /**
+     * 단건 조회
+     */
+    public function show(int $id)
+    {
+        return ApiResponse::handle(function () use ($id) {
+            return $this->service->show($id);
+        }, __('message.order.fetched'));
+    }
+
+    /**
+     * 생성
+     */
+    public function store(StoreOrderRequest $request)
+    {
+        return ApiResponse::handle(function () use ($request) {
+            return $this->service->store($request->validated());
+        }, __('message.order.created'));
+    }
+
+    /**
+     * 수정
+     */
+    public function update(UpdateOrderRequest $request, int $id)
+    {
+        return ApiResponse::handle(function () use ($request, $id) {
+            return $this->service->update($id, $request->validated());
+        }, __('message.order.updated'));
+    }
+
+    /**
+     * 삭제
+     */
+    public function destroy(int $id)
+    {
+        return ApiResponse::handle(function () use ($id) {
+            $this->service->destroy($id);
+
+            return 'success';
+        }, __('message.order.deleted'));
+    }
+
+    /**
+     * 상태 변경
+     */
+    public function updateStatus(UpdateOrderStatusRequest $request, int $id)
+    {
+        return ApiResponse::handle(function () use ($request, $id) {
+            return $this->service->updateStatus($id, $request->validated()['status']);
+        }, __('message.order.status_updated'));
+    }
+}