Handle DNSimple API response for nonexistent subdomain (#7324)

* handle OAuth response

* revert comment removal

* handle lowercased domain value

* expand error detection logic for all non-expected responses

* shell-independent lowercasing

* revert; domain value already lowercased

* add missing double-quotes

* use zone records endpoint fallback when zone cannot be identified

* add logic missing from previous

---------

Co-authored-by: neil <github@neilpang.com>
Co-authored-by: Mashiro <adadam@qq.com>
Co-authored-by: MBWhitestone <25477219+MBWhitestone@users.noreply.github.com>
Co-authored-by: Pablo <Pablo1@users.noreply.github.com>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

dnsapi/dns_dnsimple.sh

@@ -15,7 +15,7 @@ DNSimple_API="https://api.dnsimple.com/v2"
 
 # Usage: add  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
 dns_dnsimple_add() {
-  fulldomain=$1
+  fulldomain=$(echo "$1" | _lower_case)
   txtvalue=$2
 
   DNSimple_OAUTH_TOKEN="${DNSimple_OAUTH_TOKEN:-$(_readaccountconf_mutable DNSimple_OAUTH_TOKEN)}"
@@ -56,7 +56,7 @@ dns_dnsimple_add() {
 
 # fulldomain
 dns_dnsimple_rm() {
-  fulldomain=$1
+  fulldomain=$(echo "$1" | _lower_case)
 
   DNSimple_OAUTH_TOKEN="${DNSimple_OAUTH_TOKEN:-$(_readaccountconf_mutable DNSimple_OAUTH_TOKEN)}"
   if [ -z "$DNSimple_OAUTH_TOKEN" ]; then
@@ -110,9 +110,13 @@ _get_root() {
       return 1
     fi
 
-    if _contains "$response" 'not found'; then
-      _debug "$h not found"
-    else
+    if ! _contains "$response" "\"name\":\"$h\""; then
+      if ! _dnsimple_rest GET "$_account_id/zones/$h/records?per_page=1"; then
+        return 1
+      fi
+    fi
+
+    if _contains "$response" "\"name\":\"$h\"" || _contains "$response" '"pagination":'; then
       _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-"$previous")
       _domain="$h"
 
@@ -121,6 +125,7 @@ _get_root() {
 
       return 0
     fi
+    _debug "$h not found"
 
     previous="$i"
     i=$(_math "$i" + 1)