CourseHub: AJAX video course player (PHP + MySQL + Bootstrap + Plyr)

Scans nested course folders for mp4s, tracks per-user resume position
and per-folder progress. SPA frontend with hash routing over a JSON API;
range-request streaming via stream.php.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scan.php

@@ -0,0 +1,13 @@
+<?php
+// CLI library scan (for cron or manual runs):  php scan.php
+// From the browser, use the "Rescan library" button (api/scan.php).
+require_once __DIR__ . '/includes/functions.php';
+
+if (PHP_SAPI !== 'cli') {
+    header('Location: index.php');
+    exit;
+}
+
+$stats = scanLibrary();
+echo "Scan complete: {$stats['folders']} folders, {$stats['videos']} videos"
+   . " ({$stats['missing_folders']} folders / {$stats['missing_videos']} videos flagged missing)\n";