fix: modify AI API

Author: lu-yg

base/src/main/java/com/tinyengine/it/controller/AiChatController.java

@@ -27,7 +27,6 @@
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;