Tune default embedding max batch size to 1024

- Lower EmbeddingRetryOptions.MaxEmbeddingBatchSize default from 2048 to 1024
- Align appsettings default (AIOptions:EmbeddingRetry:MaxEmbeddingBatchSize) to 1024

Author: BenjaminMichaelis

EssentialCSharp.Chat.Shared/Models/EmbeddingRetryOptions.cs

@@ -39,7 +39,7 @@ public sealed class EmbeddingRetryOptions
     /// The service may adaptively downshift below this value when throttled.
     /// </summary>
     [Range(1, 2048)]
-    public int MaxEmbeddingBatchSize { get; set; } = 2048;
+    public int MaxEmbeddingBatchSize { get; set; } = 1024;
 
     /// <summary>
     /// Minimum delay between embedding API requests in milliseconds.

EssentialCSharp.Web/appsettings.json

@@ -25,7 +25,7 @@
       "MaxRetries": 5,
       "BaseDelayMs": 1000,
       "MaxDelayMs": 60000,
-      "MaxEmbeddingBatchSize": 2048,
+      "MaxEmbeddingBatchSize": 1024,
       "MinInterRequestDelayMs": 250,
       "BackoffMultiplier": 2.0,
       "MaxJitterFraction": 0.2