feat: replace /archive with release-cardinal searchable browser (Phase 9 §8.H)

Retire the three-card overview for a search + medium + genre browser over all
releases. Adds q/genre filter params to the api/release paged read path,
mirroring the existing api/track/page TrackFilter pattern.

DeepDrftPublic.Client/Clients/ReleaseClient.cs

@@ -29,7 +29,9 @@ public class ReleaseClient
         int page,
         int pageSize,
         string? sortColumn = null,
-        bool sortDescending = false)
+        bool sortDescending = false,
+        string? search = null,
+        string? genre = null)
     {
         var queryArgs = new Dictionary<string, string?>
         {
@@ -40,6 +42,12 @@ public class ReleaseClient
         if (!string.IsNullOrEmpty(medium))
             queryArgs["medium"] = medium;
 
+        if (!string.IsNullOrEmpty(search))
+            queryArgs["q"] = search;
+
+        if (!string.IsNullOrEmpty(genre))
+            queryArgs["genre"] = genre;
+
         if (!string.IsNullOrEmpty(sortColumn))
             queryArgs["sortColumn"] = sortColumn;