fix(providers): align compatible chat client and response test

src/providers/compatible.rs

@@ -1054,7 +1054,7 @@ impl Provider for OpenAiCompatibleProvider {
 
         let url = self.chat_completions_url();
         let response = self
-            .apply_auth_header(self.client.post(&url).json(&native_request), credential)
+            .apply_auth_header(self.http_client().post(&url).json(&native_request), credential)
             .send()
             .await?;
 
@@ -1635,6 +1635,7 @@ mod tests {
                     arguments: Some(r#"{"command":"pwd"}"#.to_string()),
                 }),
             }]),
+            reasoning_content: None,
         };
 
         let parsed = OpenAiCompatibleProvider::parse_native_response(message);