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]>

resources/views/admin/settings.blade.php

@@ -317,6 +317,51 @@
     </div>
 </div>
 
+{{-- ── NAS Storage ───────────────────────────────────────────── --}}
+<div class="settings-section">
+    <div class="settings-section-header">
+        <i class="bi bi-hdd-network"></i>
+        NAS Storage
+        @if($settings['nas_sync_enabled'] === 'true')
+            <span class="chip chip-green" style="margin-left:6px;"><span class="chip-dot"></span> Enabled</span>
+        @else
+            <span class="chip chip-red" style="margin-left:6px;"><span class="chip-dot"></span> Disabled</span>
+        @endif
+    </div>
+    <div class="settings-section-body">
+
+        <div class="setting-row" style="padding-top:0;">
+            <div class="setting-label">
+                <strong>Use NAS as primary storage</strong>
+                <small>
+                    When enabled, uploads go <strong>directly to the NAS</strong> — no permanent local copy is kept.
+                    Files are stored at <code>users/{username}/videos/{title-slug}/</code> on the NAS share.
+                    Thumbnails and video are fetched from NAS on demand for streaming and playback.
+                    When disabled, files are stored in local storage using the same directory schema.
+                    Requires the NAS connection to be configured under
+                    <a href="{{ route('admin.nas-storage') }}" style="color:var(--brand)">NAS Storage</a>.
+                </small>
+            </div>
+            <div class="setting-control">
+                <label class="toggle-wrap">
+                    <div class="toggle-switch">
+                        <input type="checkbox" id="nasSyncInput" name="nas_sync_enabled_check"
+                               {{ $settings['nas_sync_enabled'] === 'true' ? 'checked' : '' }}>
+                        <div class="toggle-track"></div>
+                        <div class="toggle-thumb"></div>
+                    </div>
+                    <span class="toggle-label" id="nasSyncLabel">
+                        {{ $settings['nas_sync_enabled'] === 'true' ? 'Enabled' : 'Disabled' }}
+                    </span>
+                </label>
+                <input type="hidden" name="nas_sync_enabled" id="nasSyncHidden"
+                       value="{{ $settings['nas_sync_enabled'] }}">
+            </div>
+        </div>
+
+    </div>
+</div>
+
 {{-- ── Save ─────────────────────────────────────────────────── --}}
 <div class="save-bar">
     <a href="{{ route('admin.dashboard') }}" class="adm-btn">Cancel</a>
@@ -347,6 +392,15 @@ function selectEncoder(el) {
     document.getElementById('gpuPresetSelect').value = isCpu ? 'fast' : 'p4';
 }
 
+// ── NAS sync toggle ───────────────────────────────────────────
+const nasToggle = document.getElementById('nasSyncInput');
+const nasHidden = document.getElementById('nasSyncHidden');
+const nasLabel  = document.getElementById('nasSyncLabel');
+nasToggle.addEventListener('change', () => {
+    nasHidden.value       = nasToggle.checked ? 'true' : 'false';
+    nasLabel.textContent  = nasToggle.checked ? 'Enabled' : 'Disabled';
+});
+
 // ── GPU toggle ────────────────────────────────────────────────
 const gpuToggle = document.getElementById('gpuEnabledInput');
 const gpuHidden = document.getElementById('gpuEnabledHidden');