docs(template): changelog frontmatter 新增 author 字段（推送者登录名+GIT 后缀）

CHANGELOG_TEMPLATE.md

@@ -3,6 +3,7 @@ schema: "hl-changelog/v2"
 ticket: "{issue-no}"
 title: "{一句话概括变化}"
 consumer: "{admin|mp|internal|multiple}"
+author: "{推送者登录名}(GIT)"  # 如 wx(GIT)/yst(GIT)，谁 push 到 main 就写谁
 change_type: "{新增接口|修改接口|删除接口}"
 backend_status: "pending"
 gateway_status: "pending"