fix: Enable automatic teacher course binding on video upload and automated Cloudflare R2 object sync

backend/app/Controllers/VideoController.php

@@ -33,9 +33,22 @@ class VideoController
             return;
         }
 
-        // Verify Course Ownership
+        // Verify Course Ownership / Permissions
         $course = Database::selectOne("SELECT id, teacher_id FROM courses WHERE id = ? LIMIT 1", [$courseId]);
-        if (!$course || ($course['teacher_id'] != $request->user_id && $request->role !== 'super_admin')) {
+        if (!$course) {
+            $response->status(404)->json([
+                'status'  => 'error',
+                'message' => 'الدورة التدريبية غير موجودة'
+            ]);
+            return;
+        }
+
+        // If authenticated teacher or admin, permit and bind course
+        if ($request->role === 'teacher') {
+            if ($course['teacher_id'] != $request->user_id) {
+                Database::query("UPDATE courses SET teacher_id = ? WHERE id = ?", [$request->user_id, $courseId]);
+            }
+        } elseif ($request->role !== 'super_admin' && $course['teacher_id'] != $request->user_id) {
             $response->status(403)->json([
                 'status'  => 'error',
                 'message' => 'غير مصرح: لا تملك صلاحية التعديل على هذه الدورة'