feat: add COPYRIGHT (#183)

vitepress-docs/docs/en/cli.md

@@ -79,6 +79,8 @@ ENABLE_USER_CREATE_EMAIL = true
 ENABLE_USER_DELETE_EMAIL = true
 # Allow automatic replies to emails
 ENABLE_AUTO_REPLY = false
+# Footer text
+# COPYRIGHT = "Dream Hunter"
 # default send balance, if not set, it will be 0
 # DEFAULT_SEND_BALANCE = 1
 # dkim config

vitepress-docs/docs/zh/guide/cli/worker.md

@@ -37,6 +37,8 @@ ENABLE_USER_CREATE_EMAIL = true
 ENABLE_USER_DELETE_EMAIL = true
 # 允许自动回复邮件
 ENABLE_AUTO_REPLY = false
+# 前端界面页脚文本
+# COPYRIGHT = "Dream Hunter"
 # 默认发送邮件余额，如果不设置，将为 0
 # DEFAULT_SEND_BALANCE = 1
 # dkim config