feat: [품질관리] 백엔드 API 구현 - 품질관리서 + 실적신고

- 품질관리서(quality_documents) CRUD API 14개 엔드포인트
- 실적신고(performance_reports) 관리 API 6개 엔드포인트
- DB 마이그레이션 4개 테이블 (quality_documents, quality_document_orders, quality_document_locations, performance_reports)
- 모델 4개 + 서비스 2개 + 컨트롤러 2개 + FormRequest 4개
- stats() ambiguous column 버그 수정 (JOIN 시 테이블 접두사 추가)
- missing() status_code 컬럼명/값 수정

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

app/Models/Qualitys/PerformanceReport.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace App\Models\Qualitys;
+
+use App\Models\Members\User;
+use App\Traits\Auditable;
+use App\Traits\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class PerformanceReport extends Model
+{
+    use Auditable, BelongsToTenant, SoftDeletes;
+
+    protected $table = 'performance_reports';
+
+    const STATUS_UNCONFIRMED = 'unconfirmed';
+
+    const STATUS_CONFIRMED = 'confirmed';
+
+    const STATUS_REPORTED = 'reported';
+
+    protected $fillable = [
+        'tenant_id',
+        'quality_document_id',
+        'year',
+        'quarter',
+        'confirmation_status',
+        'confirmed_date',
+        'confirmed_by',
+        'memo',
+        'created_by',
+        'updated_by',
+        'deleted_by',
+    ];
+
+    protected $casts = [
+        'confirmed_date' => 'date',
+        'year' => 'integer',
+        'quarter' => 'integer',
+    ];
+
+    // ===== Relationships =====
+
+    public function qualityDocument()
+    {
+        return $this->belongsTo(QualityDocument::class);
+    }
+
+    public function confirmer()
+    {
+        return $this->belongsTo(User::class, 'confirmed_by');
+    }
+
+    public function creator()
+    {
+        return $this->belongsTo(User::class, 'created_by');
+    }
+
+    // ===== Status Helpers =====
+
+    public function isUnconfirmed(): bool
+    {
+        return $this->confirmation_status === self::STATUS_UNCONFIRMED;
+    }
+
+    public function isConfirmed(): bool
+    {
+        return $this->confirmation_status === self::STATUS_CONFIRMED;
+    }
+
+    public function isReported(): bool
+    {
+        return $this->confirmation_status === self::STATUS_REPORTED;
+    }
+}