feat: limit output token

src/src/StevesBot.Library/Gemini/GenerationConfig.cs

@@ -3,5 +3,5 @@ namespace StevesBot.Library.Gemini;
 internal sealed record GenerationConfig
 {
   public double Temperature { get; init; } = 1.0;
-  public int MaxOutputTokens { get; init; } = 500;
+  public int MaxOutputTokens { get; init; } = 300;
 }