Replaced GetEmbeddingCacheSize with GetStats, fixed long loading times for front-end stats retrieval

src/Server/Models/ConfigModels.cs

@@ -6,7 +6,7 @@ namespace Server.Models;
 
 public class EmbeddingSearchOptions : ApiKeyOptions
 {
-    public required ConnectionStringsSection ConnectionStrings { get; set; }
+    public required ConnectionStringsOptions ConnectionStrings { get; set; }
     public ElmahOptions? Elmah { get; set; }
     public required long EmbeddingCacheMaxCount { get; set; }
     public required Dictionary<string, AiProvider> AiProviders { get; set; }
@@ -34,3 +34,8 @@ public class SimpleUser
     public string Password { get; set; } = "";
     public string[] Roles { get; set; } = [];
 }
+
+public class ConnectionStringsOptions
+{
+    public required string SQL { get; set; }
+}