Lower default TTL to 120s and make it configurable via cPanel_TTL

14400s (4 hours) is unnecessarily long for ephemeral ACME challenge TXT
records and slows down retries and cleanup. Default to 120s, consistent
with other DNS plugins, while allowing users whose providers enforce
higher minimums to override via the cPanel_TTL environment variable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dnsapi/dns_cpanel_uapi.sh

@@ -8,6 +8,7 @@ Options:
  cPanel_Username Username
  cPanel_Apitoken API Token
  cPanel_Hostname Server URL. E.g. "https://hostname:port"
+ cPanel_TTL optional TXT record TTL in seconds. Default: 120
 Issues: github.com/acmesh-official/acme.sh/issues/6877
 Author: Adam Bodnar
 '
@@ -46,8 +47,14 @@ dns_cpanel_uapi_add() {
   fi
   _debug "Zone serial: $_serial"
 
+  # Use configurable TTL, default 120 seconds
+  _ttl="${cPanel_TTL:-$(_readaccountconf_mutable cPanel_TTL)}"
+  if [ -z "$_ttl" ]; then
+    _ttl=120
+  fi
+
   # URL-encode the JSON add parameter
-  _add_json="%7B%22dname%22%3A%22${_record_name}%22%2C%22ttl%22%3A14400%2C%22record_type%22%3A%22TXT%22%2C%22data%22%3A%5B%22${txtvalue}%22%5D%7D"
+  _add_json="%7B%22dname%22%3A%22${_record_name}%22%2C%22ttl%22%3A${_ttl}%2C%22record_type%22%3A%22TXT%22%2C%22data%22%3A%5B%22${txtvalue}%22%5D%7D"
   _debug "add_json (encoded): $_add_json"
 
   if ! _cpanel_uapi_request "execute/DNS/mass_edit_zone?zone=${_domain}&serial=${_serial}&add=${_add_json}"; then
@@ -130,6 +137,10 @@ _cpanel_uapi_checkcredentials() {
   _saveaccountconf_mutable cPanel_Username "$cPanel_Username"
   _saveaccountconf_mutable cPanel_Apitoken "$cPanel_Apitoken"
   _saveaccountconf_mutable cPanel_Hostname "$cPanel_Hostname"
+
+  if [ -n "$cPanel_TTL" ]; then
+    _saveaccountconf_mutable cPanel_TTL "$cPanel_TTL"
+  fi
   return 0
 }