Add --list-profiles command to show CA profiles

This commit introduces a new command, `--list-profiles`, to allow users to discover the certificate profiles supported by a Certificate Authority.

The command queries the `meta.profiles` object within the ACME directory JSON for the selected server and formats the output for readability. If a CA does not publish profiles in its directory, the command reports that none were found.

Usage:
  acme.sh --list-profiles [--server letsencrypt]

Author: szhu25

acme.sh

@@ -5838,6 +5838,49 @@ list() {
 
 }
 
+list_profiles() {
+  _initpath
+  _initAPI
+
+  _l_server_url="$ACME_DIRECTORY"
+  _l_server_name="$(_getCAShortName "$_l_server_url")"
+  _info "Fetching profiles from $_l_server_name ($_l_server_url)..."
+
+  # _initAPI fetches the directory, so we just need to parse its response.
+  response=$(_get "$_l_server_url" "" 10)
+  if [ "$?" != "0" ]; then
+    _err "Failed to connect to CA directory: $_l_server_url"
+    return 1
+  fi
+
+  # Isolate the profiles object using the script's regex tool
+  profiles_json=$(echo "$response" | _egrep_o '"profiles" *: *\{[^\}]*\}')
+
+  if [ -z "$profiles_json" ]; then
+    _info "The CA '$_l_server_name' does not publish certificate profiles via its directory endpoint."
+    return 0
+  fi
+
+  # Strip the outer layer to get the key-value pairs
+  profiles_kv=$(echo "$profiles_json" | sed 's/"profiles" *: *{//' | sed 's/}$//' | tr ',' '\n')
+
+  printf "\n%-15s %s\n" "name" "info"
+  printf -- "--------------------------------------------------------------------\n"
+
+  _old_IFS="$IFS"
+  IFS='
+'
+  for pair in $profiles_kv; do
+    # Trim quotes and whitespace
+    _name=$(echo "$pair" | cut -d: -f1 | tr -d '" \t')
+    _info_url=$(echo "$pair" | cut -d: -f2- | sed 's/^ *//' | tr -d '"')
+    printf "%-15s %s\n" "$_name" "$_info_url"
+  done
+  IFS="$_old_IFS"
+
+  return 0
+}
+
 _deploy() {
   _d="$1"
   _hooks="$2"
@@ -7498,6 +7541,9 @@ _process() {
     --set-default-chain)
       _CMD="setdefaultchain"
       ;;
+    --list-profiles)
+      _CMD="list_profiles"
+      ;;      
     -d | --domain)
       _dvalue="$2"
 
@@ -8063,6 +8109,9 @@ _process() {
   setdefaultchain)
     setdefaultchain "$_preferred_chain"
     ;;
+  list_profiles)
+    list_profiles
+    ;;    
   *)
     if [ "$_CMD" ]; then
       _err "Invalid command: $_CMD"