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

backend/app/Models/LessonProgress.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class LessonProgress extends Model
+{
+    protected $table = 'lesson_progress';
+
+    protected $fillable = [
+        'user_id',
+        'lesson_id',
+        'last_position_seconds',
+        'watched_percentage',
+        'completed_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'completed_at' => 'datetime',
+        ];
+    }
+
+    public function lesson(): BelongsTo
+    {
+        return $this->belongsTo(Lesson::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}