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

backend/app/Services/VideoService.php

@@ -151,9 +151,27 @@ class VideoService
         // Attempt automated Server-Side HLS Transcoding
         $hlsResult = self::transcodeToHls($targetPath, $courseId, $videoUuid);
 
+        // Attempt automated sync to Cloudflare R2
+        $r2Config = self::getR2Config();
+        $r2VideoUrl = null;
+        if (!empty($r2Config['access_key']) && !empty($r2Config['secret_key']) && !empty($r2Config['bucket'])) {
+            $r2Key = "videos/{$courseId}/{$targetFileName}";
+            $r2VideoUrl = self::uploadToR2($targetPath, $r2Key, $mime);
+
+            $thumbnailPath = dirname(__DIR__, 2) . '/storage/hls/' . $courseId . '/' . $videoUuid . '/thumbnail.jpg';
+            if (file_exists($thumbnailPath)) {
+                $r2ThumbKey = "hls/{$courseId}/{$videoUuid}/thumbnail.jpg";
+                $r2ThumbUrl = self::uploadToR2($thumbnailPath, $r2ThumbKey, 'image/jpeg');
+                if ($r2ThumbUrl) {
+                    $hlsResult['thumbnail_url'] = $r2ThumbUrl;
+                }
+            }
+        }
+
         return [
             'video_uuid'      => $videoUuid,
             'local_path'      => $relativePath,
+            'r2_url'          => $r2VideoUrl,
             'hls_url'         => $hlsResult['hls_url'] ?? null,
             'thumbnail_url'   => $hlsResult['thumbnail_url'] ?? null,
             'duration'        => $hlsResult['duration_seconds'] ?? 0,