remove whiptail from update scripts for unattended update support (#11712)

* Simplify Alpine update scripts to run upgrade

Remove interactive whiptail menus, loops and newt dependency checks from ct/alpine-docker.sh, ct/alpine-zigbee2mqtt.sh, and ct/alpine.sh. Each update_script now simply calls header_info, runs $STD apk -U upgrade, displays a success message and exits, simplifying and automating the update flow.

* feat(update-scripts): replace whiptail with msg_menu for unattended updates

Remove all whiptail dialogs from ct update_script() functions and replace
with msg_menu() - a lightweight read-based menu that supports:
- PHS_SILENT=1: auto-selects first (default) option for unattended mode
- Interactive: numbered menu with 10s timeout and default fallback

Converted scripts (whiptail menu → msg_menu):
- plex.sh, npmplus.sh, cronicle.sh, meilisearch.sh, node-red.sh
- homeassistant.sh, podman-homeassistant.sh
- vaultwarden.sh, alpine-vaultwarden.sh
- loki.sh, alpine-loki.sh
- alpine-grafana.sh, alpine-redis.sh, alpine-valkey.sh
- alpine-nextcloud.sh

Simplified scripts (removed unnecessary whiptail for single-action updates):
- alpine.sh, alpine-docker.sh, alpine-zigbee2mqtt.sh

Special handling:
- gitea-mirror.sh: replaced yesno/msgbox with read -rp confirmations,
  exit 75 in silent mode for major version upgrades requiring interaction
- vaultwarden.sh/alpine-vaultwarden.sh: passwordbox replaced with
  read -r -s -p, skipped in silent mode with warning
- nginxproxymanager.sh: exit 1 → exit 75 for disabled script

Infrastructure:
- Added msg_menu() helper to misc/build.func
- Added exit code 75 handling in update-apps.sh (skip, not fail)

Closes #11620

* refactor(update-scripts): remove menus where sequential updates suffice

- alpine-nextcloud: add apk upgrade as the update action (was missing)
- meilisearch: run meilisearch + UI updates sequentially (like bar-assistant)
- npmplus: run alpine upgrade + docker pull sequentially, no menu
- vaultwarden: update VaultWarden + Web-Vault sequentially, remove admin
  token option (interactive-only, not suitable for unattended updates)
- alpine-vaultwarden: just run apk upgrade, remove admin token menu

misc/build.func

@@ -3318,6 +3318,68 @@ configure_ssh_settings() {
   fi
 }
 
+# ------------------------------------------------------------------------------
+# msg_menu()
+#
+# - Displays a numbered menu for update_script() functions
+# - In silent mode (PHS_SILENT=1): auto-selects the default option
+# - In interactive mode: shows menu via read with 10s timeout + default fallback
+# - Usage: CHOICE=$(msg_menu "Title" "tag1" "Description 1" "tag2" "Desc 2" ...)
+# - The first item is always the default
+# - Returns the selected tag to stdout
+# - If no valid selection or timeout, returns the default (first) tag
+# ------------------------------------------------------------------------------
+msg_menu() {
+  local title="$1"
+  shift
+
+  # Parse items into parallel arrays: tags[] and descriptions[]
+  local -a tags=()
+  local -a descs=()
+  while [[ $# -ge 2 ]]; do
+    tags+=("$1")
+    descs+=("$2")
+    shift 2
+  done
+
+  local default_tag="${tags[0]}"
+  local count=${#tags[@]}
+
+  # Silent mode: return default immediately
+  if [[ -n "${PHS_SILENT+x}" ]] && [[ "${PHS_SILENT}" == "1" ]]; then
+    echo "$default_tag"
+    return 0
+  fi
+
+  # Display menu
+  echo ""
+  msg_custom "📋" "${BL}" "${title}"
+  echo ""
+  for i in "${!tags[@]}"; do
+    local marker="  "
+    [[ $i -eq 0 ]] && marker="* "
+    printf "${TAB3}${marker}%s) %s\n" "${tags[$i]}" "${descs[$i]}"
+  done
+  echo ""
+
+  local selection=""
+  read -r -t 10 -p "${TAB3}Select [default=${default_tag}, timeout 10s]: " selection || true
+
+  # Validate selection
+  if [[ -n "$selection" ]]; then
+    for tag in "${tags[@]}"; do
+      if [[ "$selection" == "$tag" ]]; then
+        echo "$selection"
+        return 0
+      fi
+    done
+    msg_warn "Invalid selection '${selection}' - using default: ${default_tag}"
+  fi
+
+  echo "$default_tag"
+  return 0
+}
+
 # ------------------------------------------------------------------------------
 # start()
 #