feat: [QMS] 1일차 기준/매뉴얼 심사 백엔드 구현 (Phase 2)

- 마이그레이션: audit_checklists, audit_checklist_categories, audit_checklist_items, audit_standard_documents (4테이블)
- 모델 4개: AuditChecklist, AuditChecklistCategory, AuditChecklistItem, AuditStandardDocument
- AuditChecklistService: CRUD, 완료처리, 항목 토글(lockForUpdate), 기준 문서 연결/해제, 카테고리+항목 일괄 동기화
- AuditChecklistController: 9개 엔드포인트
- FormRequest 2개: Store(카테고리+항목 중첩 검증), Update
- 라우트 9개 등록 (/api/v1/qms/checklists, checklist-items)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Requests/Qms/AuditChecklistStoreRequest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Http\Requests\Qms;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class AuditChecklistStoreRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'year' => 'required|integer|min:2020|max:2100',
+            'quarter' => 'required|integer|in:1,2,3,4',
+            'type' => 'nullable|string|max:30',
+            'categories' => 'required|array|min:1',
+            'categories.*.title' => 'required|string|max:200',
+            'categories.*.sort_order' => 'nullable|integer|min:0',
+            'categories.*.items' => 'required|array|min:1',
+            'categories.*.items.*.name' => 'required|string|max:200',
+            'categories.*.items.*.description' => 'nullable|string',
+            'categories.*.items.*.sort_order' => 'nullable|integer|min:0',
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'categories.required' => __('validation.required', ['attribute' => '카테고리']),
+            'categories.*.title.required' => __('validation.required', ['attribute' => '카테고리 제목']),
+            'categories.*.items.required' => __('validation.required', ['attribute' => '점검 항목']),
+            'categories.*.items.*.name.required' => __('validation.required', ['attribute' => '항목명']),
+        ];
+    }
+}