Added allowlist and denylist, fixed patchy configuration with proper options models, fixed api middleware authorization issues

src/Server/Models/ConfigModels.cs

@@ -1,16 +1,16 @@
 using System.Configuration;
 using ElmahCore;
+using Shared.Models;
 
 namespace Server.Models;
 
-public class EmbeddingSearchOptions
+public class EmbeddingSearchOptions : ApiKeyOptions
 {
     public required ConnectionStringsSection ConnectionStrings { get; set; }
     public ElmahOptions? Elmah { get; set; }
     public required long EmbeddingCacheMaxCount { get; set; }
-    public required AiProvider[] AiProviders { get; set; }
+    public required Dictionary<string, AiProvider> AiProviders { get; set; }
     public required SimpleAuthOptions SimpleAuth { get; set; }
-    public string[]? ApiKeys { get; set; }
     public required bool UseHttpsRedirection { get; set; }
 }
 
@@ -18,7 +18,7 @@ public class AiProvider
 {
     public required string Handler { get; set; }
     public required string BaseURL { get; set; }
-    public required string ApiKey { get; set; }
+    public string? ApiKey { get; set; }
     public required string[] Allowlist { get; set; }
     public required string[] Denylist { get; set; }
 }