Consolidate CMS /tracks into standalone /releases page

Retire the Tracks list view; promote the Releases view to /releases with
medium tabs (ALL/CUTS/SESSIONS/MIXES). Migrate bulk profile/high-res
backfill and per-track waveform columns into the releases grids. Point
catalogue cards at the three mediums. Remove dead BrowseMode/ViewModel.

DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor

@@ -23,9 +23,9 @@ else
     <MudContainer MaxWidth="MaxWidth.Large" Class="mt-8">
         <MudButton Variant="Variant.Text"
                    StartIcon="@Icons.Material.Filled.ArrowBack"
-                   Href="/tracks/archive"
+                   Href="/releases"
                    Class="mb-4">
-            Back to Release Archive
+            Back to Releases
         </MudButton>
 
         <MudText Typo="Typo.h4" GutterBottom="true">Mixes</MudText>