Refactor install menu and add settings submenu

Updated the install menu labels for clarity and dynamic numbering. Introduced a new settings_menu function to manage diagnostic, default, and storage settings, with conditional options based on the presence of app defaults.

misc/build.func

@@ -1551,18 +1551,21 @@ install_script() {
   else
     # Build dynamic menu
     local menu_items=(
-      "1" "Default Settings"
-      "2" "Default Settings (Verbose)"
-      "3" "Advanced Install"
+      "1" "Default Install"
+      "2" "Default Install (Verbose)"
+      "3" "Advanced Settings"
       "4" "My Defaults"
     )
+
+    local next=5
     if [ -f "$(get_app_defaults_path)" ]; then
-      menu_items+=("5" "App Defaults for ${APP}")
+      menu_items+=("$next" "App Defaults for ${APP}")
+      next=$((next + 1))
     fi
+
     menu_items+=(
-      "6" "Diagnostic Settings"
-      "7" "Storage Settings"
-      "8" "Exit"
+      "$next" "Settings"
+      "$((next + 1))" "Exit"
     )
 
     TMP_CHOICE=$(whiptail --backtitle "[dev] Proxmox VE Helper Scripts" \
@@ -1753,6 +1756,44 @@ install_script() {
 #   fi
 # }
 
+settings_menu() {
+  while true; do
+    local settings_items=(
+      "1" "Manage API-Diagnostic Setting"
+      "2" "Edit Default.vars"
+      "3" "Edit Default Storage"
+    )
+    if [ -f "$(get_app_defaults_path)" ]; then
+      settings_items+=("4" "Edit App.vars for ${APP}")
+      settings_items+=("5" "Exit")
+    else
+      settings_items+=("4" "Exit")
+    fi
+
+    local choice
+    choice=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
+      --title "SETTINGS MENU" \
+      --ok-button "OK" --cancel-button "Back" \
+      --menu "Choose a settings option:" 20 60 9 \
+      "${settings_items[@]}" \
+      3>&1 1>&2 2>&3) || return 0
+
+    case "$choice" in
+    1) diagnostics_menu ;;
+    2) ${EDITOR:-nano} /usr/local/community-scripts/default.vars ;;
+    3) edit_default_storage ;;
+    4)
+      if [ -f "$(get_app_defaults_path)" ]; then
+        ${EDITOR:-nano} "$(get_app_defaults_path)"
+      else
+        return 0
+      fi
+      ;;
+    5) return 0 ;;
+    esac
+  done
+}
+
 # ===== Unified storage selection & writing to vars files =====
 _write_storage_to_vars() {
   # $1 = vars_file, $2 = key (var_container_storage / var_template_storage), $3 = value