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/Models/Qualitys/AuditChecklist.php

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+<?php
+
+namespace App\Models\Qualitys;
+
+use App\Models\Traits\Auditable;
+use App\Models\Traits\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class AuditChecklist extends Model
+{
+    use Auditable, BelongsToTenant, SoftDeletes;
+
+    protected $table = 'audit_checklists';
+
+    const STATUS_DRAFT = 'draft';
+
+    const STATUS_IN_PROGRESS = 'in_progress';
+
+    const STATUS_COMPLETED = 'completed';
+
+    const TYPE_STANDARD_MANUAL = 'standard_manual';
+
+    protected $fillable = [
+        'tenant_id',
+        'year',
+        'quarter',
+        'type',
+        'status',
+        'options',
+        'created_by',
+        'updated_by',
+        'deleted_by',
+    ];
+
+    protected $casts = [
+        'year' => 'integer',
+        'quarter' => 'integer',
+        'options' => 'array',
+    ];
+
+    public function categories(): HasMany
+    {
+        return $this->hasMany(AuditChecklistCategory::class, 'checklist_id')->orderBy('sort_order');
+    }
+
+    public function isDraft(): bool
+    {
+        return $this->status === self::STATUS_DRAFT;
+    }
+
+    public function isCompleted(): bool
+    {
+        return $this->status === self::STATUS_COMPLETED;
+    }
+}

app/Models/Qualitys/AuditChecklistCategory.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Models\Qualitys;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class AuditChecklistCategory extends Model
+{
+    protected $table = 'audit_checklist_categories';
+
+    protected $fillable = [
+        'tenant_id',
+        'checklist_id',
+        'title',
+        'sort_order',
+        'options',
+    ];
+
+    protected $casts = [
+        'sort_order' => 'integer',
+        'options' => 'array',
+    ];
+
+    public function checklist(): BelongsTo
+    {
+        return $this->belongsTo(AuditChecklist::class, 'checklist_id');
+    }
+
+    public function items(): HasMany
+    {
+        return $this->hasMany(AuditChecklistItem::class, 'category_id')->orderBy('sort_order');
+    }
+}

app/Models/Qualitys/AuditChecklistItem.php

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+<?php
+
+namespace App\Models\Qualitys;
+
+use App\Models\User;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class AuditChecklistItem extends Model
+{
+    protected $table = 'audit_checklist_items';
+
+    protected $fillable = [
+        'tenant_id',
+        'category_id',
+        'name',
+        'description',
+        'is_completed',
+        'completed_at',
+        'completed_by',
+        'sort_order',
+        'options',
+    ];
+
+    protected $casts = [
+        'is_completed' => 'boolean',
+        'completed_at' => 'datetime',
+        'sort_order' => 'integer',
+        'options' => 'array',
+    ];
+
+    public function category(): BelongsTo
+    {
+        return $this->belongsTo(AuditChecklistCategory::class, 'category_id');
+    }
+
+    public function completedByUser(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'completed_by');
+    }
+
+    public function standardDocuments(): HasMany
+    {
+        return $this->hasMany(AuditStandardDocument::class, 'checklist_item_id');
+    }
+}

app/Models/Qualitys/AuditStandardDocument.php

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+<?php
+
+namespace App\Models\Qualitys;
+
+use App\Models\Documents\Document;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class AuditStandardDocument extends Model
+{
+    protected $table = 'audit_standard_documents';
+
+    protected $fillable = [
+        'tenant_id',
+        'checklist_item_id',
+        'title',
+        'version',
+        'date',
+        'document_id',
+        'options',
+    ];
+
+    protected $casts = [
+        'date' => 'date',
+        'options' => 'array',
+    ];
+
+    public function checklistItem(): BelongsTo
+    {
+        return $this->belongsTo(AuditChecklistItem::class, 'checklist_item_id');
+    }
+
+    public function document(): BelongsTo
+    {
+        return $this->belongsTo(Document::class);
+    }
+}