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>

config.example.php

@@ -0,0 +1,20 @@
+<?php
+// ---- CourseHub configuration ----
+
+// Absolute path to the directory that contains your course folders, e.g.
+//   /srv/media/courses/
+//     Course 1/Intro/Video1.mp4
+//     Course 2/Module 3/Advanced/lesson.mp4
+define('VIDEOS_ROOT', '/home/harwinder/Development/coursehub/videos');
+
+define('DB_HOST', '127.0.0.1');
+define('DB_PORT', 3306);
+define('DB_NAME', 'coursehub');
+define('DB_USER', 'coursehub');
+define('DB_PASS', 'change-me');
+
+// A video counts as "completed" once the user has watched this fraction of it.
+define('COMPLETE_THRESHOLD', 0.95);
+
+// Allow new users to self-register from the login page.
+define('ALLOW_REGISTRATION', true);