Fix CA1819 warnings in QueryFiltersLegacy

Replace array-typed properties with IReadOnlyList<T> to satisfy
CA1819 (Properties should not return arrays). Uses collection
expressions for initialization.

IReadOnlyList<T> serializes identically to a JSON array, so the
OpenAPI schema and wire format are unchanged. The only construction
site assigns the result of .ToArray(), which still satisfies
IReadOnlyList<T>.

MediaBrowser.Model/Querying/QueryFiltersLegacy.cs

@@ -1,7 +1,7 @@
 #nullable disable
 #pragma warning disable CS1591
 
-using System;
+using System.Collections.Generic;
 
 namespace MediaBrowser.Model.Querying
 {
@@ -9,18 +9,18 @@ namespace MediaBrowser.Model.Querying
     {
         public QueryFiltersLegacy()
         {
-            Genres = Array.Empty<string>();
-            Tags = Array.Empty<string>();
-            OfficialRatings = Array.Empty<string>();
-            Years = Array.Empty<int>();
+            Genres = [];
+            Tags = [];
+            OfficialRatings = [];
+            Years = [];
         }
 
-        public string[] Genres { get; set; }
+        public IReadOnlyList<string> Genres { get; set; }
 
-        public string[] Tags { get; set; }
+        public IReadOnlyList<string> Tags { get; set; }
 
-        public string[] OfficialRatings { get; set; }
+        public IReadOnlyList<string> OfficialRatings { get; set; }
 
-        public int[] Years { get; set; }
+        public IReadOnlyList<int> Years { get; set; }
     }
 }