feat: Initial commit for Saqel Platform architecture, backend, Docker, and documentation

backend/app/Models/Quiz.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\QuizFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Quiz extends Model
+{
+    /** @use HasFactory<QuizFactory> */
+    use HasFactory;
+
+    protected $fillable = ['lesson_id', 'title', 'trigger_seconds'];
+
+    public function lesson(): BelongsTo
+    {
+        return $this->belongsTo(Lesson::class);
+    }
+
+    public function questions(): HasMany
+    {
+        return $this->hasMany(Question::class);
+    }
+
+    public function attempts(): HasMany
+    {
+        return $this->hasMany(QuizAttempt::class);
+    }
+}