Make NAS the primary storage when enabled (not a mirror)

When NAS sync is enabled:
- Audio uploads: pushed to NAS via NasSyncVideoJob, local file deleted immediately after
- Video uploads: processed locally (ffprobe, compress, HLS), then at the end of
  GenerateHlsJob the final compressed file is re-synced to NAS and the local copy removed
- stream() and download(): if local file is missing, pull from NAS into a local
  stream cache (storage/app/nas_cache/videos/) and serve from there with full
  byte-range support — so seeking still works over NAS-sourced files

When NAS is disabled:
- Upload, stream, and download all use local storage exclusively (no change)

HLS segments are intentionally kept local: they are small, generated on-demand,
and serving them via per-segment SMB round-trips would hurt playback performance.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

app/Jobs/GenerateHlsJob.php

@@ -149,6 +149,16 @@ class GenerateHlsJob implements ShouldQueue
                 'encoder'  => $encoder,
             ]);
 
+            // NAS-primary storage: push the final compressed file to NAS (overwriting
+            // the uncompressed copy synced at upload time), then free local disk.
+            // HLS segments are kept local — they're small and serving them locally
+            // avoids per-segment SMB latency during HLS playback.
+            $nas = app(\App\Services\NasSyncService::class);
+            if ($nas->isEnabled()) {
+                $nas->syncVideo($video);
+                $nas->deleteLocalVideo($video);
+            }
+
         } catch (\Exception $e) {
             Log::error('GenerateHlsJob failed: ' . $e->getMessage(), ['video_id' => $video->id]);
             Storage::deleteDirectory($hlsDir);