feat(grade10): add chemistry, biology, and earth sciences virtual labs, fix video CDN playback, teacher submissions SQL, and enable authenticated lesson reading

backend/app/Services/TeacherSubmissionService.php

@@ -37,9 +37,9 @@ final class TeacherSubmissionService {
         return Database::execute(
             "UPDATE video_versions vv JOIN teacher_submissions ts ON ts.id=vv.teacher_submission_id
              SET vv.status='uploading', ts.status='uploading'
-             WHERE vv.uuid=? AND ts.teacher_id=? AND vv.status='draft'",
+             WHERE vv.uuid=? AND ts.teacher_id=? AND vv.status IN ('draft', 'uploading')",
             [$versionUuid, $teacherId]
-        ) === 1;
+        ) >= 1;
     }
     /** Releases a reservation only when no media was accepted for review. */
     public static function releaseUploadReservation(int $teacherId, string $versionUuid): void {