feat: add all Eloquent models with relationships

app/Models/AuditResponse.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class AuditResponse extends Model
+{
+    protected $fillable = ['audit_id', 'responded_by', 'response_text'];
+
+    public function audit(): BelongsTo
+    {
+        return $this->belongsTo(Audit::class);
+    }
+
+    public function responder(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'responded_by');
+    }
+}