Use NAS as primary storage — direct upload when enabled

When NAS storage is enabled, uploaded files go directly to the NAS share
(users/{username}/videos/{title-slug}/) with no permanent local copy kept.
Thumbnails and video are fetched from NAS on demand for streaming/playback.
When NAS is disabled, files are organised into the same directory schema
in local storage.

- VideoController: branch upload flow on NAS enabled/disabled
- NasSyncService: add uploadDirectToNas() for direct NAS writes,
  organizeLocalFiles() for local NAS-schema, localVideoDir() resolver,
  deleteLocalAssets() for post-sync cleanup
- GenerateHlsJob: download from NAS via ensureLocalCopy() when local
  file is absent (NAS-primary mode); clean up temp after HLS generation
- CompressVideoJob: place compressed file alongside original (any dir)
- Video/VideoSlide models: localVideoPath(), localThumbnailPath(),
  thumbnailStorageKey(), localPath(), storageKey() helpers for
  format-agnostic path resolution (old flat paths + new NAS-schema paths)
- MediaController: serve thumbnails from NAS-mirrored paths with NAS fallback
- SuperAdminController: use model path helpers for file deletion
- NasFreeLocalStorage: scan new users/ tree in addition to legacy flat dirs
- Settings: rename "NAS Storage Sync" tab to "NAS Storage", update description

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

app/Jobs/GenerateHlsJob.php

@@ -33,10 +33,23 @@ class GenerateHlsJob implements ShouldQueue
             return;
         }
 
-        $sourcePath = storage_path('app/' . $video->path);
-        if (!file_exists($sourcePath)) {
-            Log::error('GenerateHlsJob: Source file missing', ['path' => $sourcePath]);
-            return;
+        $sourcePath    = storage_path('app/' . $video->path);
+        $nasDownloaded = null; // track a NAS-fetched local copy so we can clean it up
+
+        if (! file_exists($sourcePath)) {
+            // NAS-primary mode: file lives on NAS, download a temporary local copy
+            $nas = app(\App\Services\NasSyncService::class);
+            if ($nas->isEnabled()) {
+                $localCopy = $nas->ensureLocalCopy($video);
+                if ($localCopy) {
+                    $sourcePath    = $localCopy;
+                    $nasDownloaded = $localCopy;
+                }
+            }
+            if (! file_exists($sourcePath)) {
+                Log::error('GenerateHlsJob: Source file missing', ['path' => $sourcePath]);
+                return;
+            }
         }
 
         $hlsDir  = 'public/hls/' . $video->id;
@@ -149,14 +162,19 @@ 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);
+                if ($nasDownloaded) {
+                    // NAS-primary mode: video was fetched from NAS for HLS generation.
+                    // The original is already on NAS — just delete the local temp copy.
+                    @unlink($nasDownloaded);
+                } else {
+                    // Local-storage mode: push the (compressed) file to NAS and free local disk.
+                    // HLS segments stay local — per-segment SMB latency would hurt playback.
+                    $nas->syncVideo($video);
+                    $nas->deleteLocalVideo($video);
+                    $nas->deleteLocalAssets($video);
+                }
             }
 
         } catch (\Exception $e) {