feat(email encrypt): implement base64 encoding for contact email config, only supports HEO theme

lib/plugins/mailEncrypt.js

@@ -0,0 +1,12 @@
+export const handleEmailClick = (e, emailIcon, CONTACT_EMAIL) => {
+  if (CONTACT_EMAIL && emailIcon && !emailIcon.current.href) {
+    e.preventDefault()
+    try {
+      const email = decodeURIComponent(escape(atob(CONTACT_EMAIL)))
+      emailIcon.current.href = `mailto:${email}`
+      emailIcon.current.click()
+    } catch (error) {
+      console.error('解密邮箱失败:', error)
+    }
+  }
+}