Add SiliconFlow CustomProvider for OpenAI-compatible chat/embeddings

Base URL: https://api.siliconflow.cn/v1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: HavenDV

src/libs/tryAGI.OpenAI/CustomProviders.cs

@@ -131,6 +131,11 @@ public static class CustomProviders
     /// </summary>
     public const string CleanlabBaseUrl = "https://api.cleanlab.ai/api/v1/openai_trustworthy_llm/";
 
+    /// <summary>
+    /// https://docs.siliconflow.cn/
+    /// </summary>
+    public const string SiliconFlowBaseUrl = "https://api.siliconflow.cn/v1";
+
     /// <summary>
     /// Creates an API to use for GitHub Models: https://github.com/marketplace/models
     /// </summary>
@@ -364,4 +369,13 @@ public static OpenAiClient Cleanlab(string apiKey)
     {
         return new OpenAiClient(apiKey, baseUri: new Uri(CleanlabBaseUrl));
     }
+
+    /// <summary>
+    /// Create an API to use for SiliconFlow.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiClient SiliconFlow(string apiKey)
+    {
+        return new OpenAiClient(apiKey, baseUri: new Uri(SiliconFlowBaseUrl));
+    }
 }