feat:인터뷰 시나리오 마이그레이션/모델 추가

- interview_categories, interview_templates, interview_questions 테이블 생성
- interview_sessions, interview_answers 테이블 생성
- InterviewCategory, InterviewTemplate, InterviewQuestion 모델 추가
- InterviewSession, InterviewAnswer 모델 추가
- 멀티테넌트(tenant_id) 지원, 감사 로깅(Auditable) 적용

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

app/Models/Interview/InterviewAnswer.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Models\Interview;
+
+use App\Traits\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+
+class InterviewAnswer extends Model
+{
+    use BelongsToTenant;
+
+    protected $fillable = [
+        'tenant_id',
+        'interview_session_id',
+        'interview_question_id',
+        'interview_template_id',
+        'is_checked',
+        'answer_text',
+        'memo',
+    ];
+
+    protected $casts = [
+        'is_checked' => 'boolean',
+    ];
+
+    public function session()
+    {
+        return $this->belongsTo(InterviewSession::class, 'interview_session_id');
+    }
+
+    public function question()
+    {
+        return $this->belongsTo(InterviewQuestion::class, 'interview_question_id');
+    }
+
+    public function template()
+    {
+        return $this->belongsTo(InterviewTemplate::class, 'interview_template_id');
+    }
+}