fix: tencent InvalidParameter error

fix "Messages 中 system 角色必须位于列表的最开始"

app/client/platforms/tencent.ts

@@ -91,8 +91,9 @@ export class HunyuanApi implements LLMApi {
 
   async chat(options: ChatOptions) {
     const visionModel = isVisionModel(options.config.model);
-    const messages = options.messages.map((v) => ({
-      role: v.role,
+    const messages = options.messages.map((v, index) => ({
+      // "Messages 中 system 角色必须位于列表的最开始"
+      role: index !== 0 && v.role === "system" ? "user" : v.role,
       content: visionModel ? v.content : getMessageTextContent(v),
     }));