feat: G-1 작업지시 관리 API 구현

- 작업지시 테이블 마이그레이션 (work_orders, work_order_items, work_order_bending_details, work_order_issues)
- 작업지시 모델 4개 (WorkOrder, WorkOrderItem, WorkOrderBendingDetail, WorkOrderIssue)
- WorkOrderService 비즈니스 로직 구현
- WorkOrderController REST API 엔드포인트 11개
- FormRequest 검증 클래스 5개
- Swagger API 문서화 완료

API Endpoints:
- GET /work-orders (목록)
- GET /work-orders/stats (통계)
- POST /work-orders (등록)
- GET /work-orders/{id} (상세)
- PUT /work-orders/{id} (수정)
- DELETE /work-orders/{id} (삭제)
- PATCH /work-orders/{id}/status (상태변경)
- PATCH /work-orders/{id}/assign (담당자배정)
- PATCH /work-orders/{id}/bending/toggle (벤딩토글)
- POST /work-orders/{id}/issues (이슈등록)
- PATCH /work-orders/{id}/issues/{issueId}/resolve (이슈해결)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/Http/Requests/WorkOrder/WorkOrderStoreRequest.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Http\Requests\WorkOrder;
+
+use App\Models\Production\WorkOrder;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class WorkOrderStoreRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            // 기본 정보
+            'sales_order_id' => 'nullable|integer|exists:orders,id',
+            'project_name' => 'nullable|string|max:200',
+            'process_type' => ['required', Rule::in(WorkOrder::PROCESS_TYPES)],
+            'status' => ['nullable', Rule::in(WorkOrder::STATUSES)],
+            'assignee_id' => 'nullable|integer|exists:users,id',
+            'team_id' => 'nullable|integer|exists:departments,id',
+            'scheduled_date' => 'nullable|date',
+            'memo' => 'nullable|string',
+            'is_active' => 'nullable|boolean',
+
+            // 품목 배열
+            'items' => 'nullable|array',
+            'items.*.item_id' => 'nullable|integer|exists:items,id',
+            'items.*.item_name' => 'required|string|max:200',
+            'items.*.specification' => 'nullable|string|max:500',
+            'items.*.quantity' => 'nullable|numeric|min:0',
+            'items.*.unit' => 'nullable|string|max:20',
+
+            // 벤딩 상세 (process_type이 bending인 경우)
+            'bending_detail' => 'nullable|array',
+            'bending_detail.shaft_cutting' => 'nullable|boolean',
+            'bending_detail.bearing' => 'nullable|boolean',
+            'bending_detail.shaft_welding' => 'nullable|boolean',
+            'bending_detail.assembly' => 'nullable|boolean',
+            'bending_detail.winder_welding' => 'nullable|boolean',
+            'bending_detail.frame_assembly' => 'nullable|boolean',
+            'bending_detail.bundle_assembly' => 'nullable|boolean',
+            'bending_detail.motor_assembly' => 'nullable|boolean',
+            'bending_detail.bracket_assembly' => 'nullable|boolean',
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'process_type.required' => __('validation.required', ['attribute' => '공정유형']),
+            'process_type.in' => __('validation.in', ['attribute' => '공정유형']),
+            'items.*.item_name.required' => __('validation.required', ['attribute' => '품목명']),
+        ];
+    }
+}