fix(codegen): 更新API调用方法名

- 将add方法更改为create方法以匹配API接口定义
- 确保表单数据提交逻辑一致性
- 保持成功消息提示功能不变

src/main/resources/templates/codegen/index.vue.vm

@@ -363,7 +363,7 @@
               })
               .finally(() => (loading.value = false));
         } else {
-                ${entityName}API.add(formData)
+                ${entityName}API.create(formData)
               .then(() => {
                 ElMessage.success("新增成功");
                 handleCloseDialog();