fix: install script for Debian 13 (Python 3.13) compatibility

- Split apt-get deps by distro version to avoid missing package failures
  (python3-distutils-extra removed in 3.12+, ntp replaced by systemd-timesyncd)
- Dynamically detect Python version for python3.XX-venv package
- Guard bare `pip` call with trixie exclusion and error suppression
- Check unattended-upgrades file exists before copying
- Fix 3 missing closing parentheses in site_backup.py format strings
- Update remaining Nginx references in comments and help text

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

install

@@ -206,33 +206,59 @@ wo_dir_init() {
 wo_install_dep() {
     local wo_linux_distro
     wo_linux_distro=$(lsb_release -is)
-    wo_python_venv=$(apt-cache policy python3.12-venv 2>&1 | grep -q Installed)
+    local python_ver
+    python_ver=$(python3 -c "import sys; print(sys.version_info[1])")
+    local wo_distro_codename
+    wo_distro_codename=$(lsb_release -sc)
+
+    # base packages available on all supported distros
+    local base_deps="build-essential curl gzip gcc python3-dev python3-pip python3-apt \
+ca-certificates sqlite3 git tar software-properties-common pigz apt-transport-https \
+gnupg2 cron ccze rsync tree ufw tzdata zstd libapt-pkg-dev bash-completion"
+
+    # distro-specific packages
+    local extra_deps=""
+    case "$wo_distro_codename" in
+        trixie)
+            # Debian 13: ntp replaced by systemd-timesyncd, distutils removed
+            extra_deps="dirmngr sudo python3-full systemd-timesyncd"
+            ;;
+        bookworm)
+            extra_deps="dirmngr sudo python3-distutils-extra haveged unattended-upgrades ntp idn"
+            ;;
+        noble)
+            extra_deps="python3-distutils-extra haveged unattended-upgrades ntp idn"
+            ;;
+        *)
+            extra_deps="dirmngr sudo python3-distutils-extra haveged unattended-upgrades ntp idn"
+            ;;
+    esac
+
     if [ "$wo_linux_distro" == "Ubuntu" ]; then
-        # install dependencies
         add-apt-repository ppa:git-core/ppa -y
-        apt-get --option=Dpkg::options::=--force-confmiss --option=Dpkg::options::=--force-confold --assume-yes install \
-            build-essential curl gzip python3-pip python3-apt python3-venv gcc python3-dev sqlite3 git tar software-properties-common pigz \
-            gnupg2 cron ccze rsync apt-transport-https tree haveged ufw unattended-upgrades tzdata ntp zstd idn \
-            python3-distutils-extra libapt-pkg-dev bash-completion >/dev/null 2>&1
-        if $wo_python_venv; then
-            apt install -yy python3.12-venv >/dev/null 2>&1
     fi
 
-    else
     # install dependencies
-        apt-get --option=Dpkg::options::=--force-confmiss --option=Dpkg::options::=--force-confold --assume-yes install \
-            build-essential curl gzip dirmngr sudo python3-pip python3-apt python3-venv gcc python3-dev ca-certificates sqlite3 git tar \
-            software-properties-common pigz apt-transport-https gnupg2 cron ccze rsync tree haveged ufw unattended-upgrades tzdata ntp zstd idn \
-            python3-distutils-extra libapt-pkg-dev bash-completion >/dev/null 2>&1
+    apt-get --option=Dpkg::options::=--force-confmiss --option=Dpkg::options::=--force-confold \
+        --assume-yes install $base_deps $extra_deps >/dev/null 2>&1
+
+    # install versioned python3-venv package
+    apt-get --assume-yes install "python3.${python_ver}-venv" >/dev/null 2>&1 || \
+        apt-get --assume-yes install python3-venv >/dev/null 2>&1
+
+    if [ "$wo_linux_distro" != "Ubuntu" ]; then
         # add php repository gpg key
         curl -sSLo /tmp/debsuryorg-archive-keyring.deb https://packages.sury.org/debsuryorg-archive-keyring.deb
         dpkg -i /tmp/debsuryorg-archive-keyring.deb && rm -f /tmp/debsuryorg-archive-keyring.deb
     fi
+
     locale-gen en
-    # enable unattended upgades
+    # enable unattended upgrades
+    if [ -f /usr/share/unattended-upgrades/20auto-upgrades ]; then
         if [ ! -f /etc/apt/apt.conf.d/20auto-upgrades ]; then
             cp -f /usr/share/unattended-upgrades/20auto-upgrades /etc/apt/apt.conf.d/20auto-upgrades
         fi
+    fi
 }
 
 wo_download_gpg_keys() {
@@ -481,8 +507,8 @@ wo_install() {
     if [ -d /usr/local/lib/python3."$python_ver"/dist-packages ]; then
         cd /usr/local/lib/python3."$python_ver"/dist-packages || exit 1
     fi
-    if [ "$wo_distro_codename" != "bookworm" ]; then
-        pip uninstall -yq wo wordops ee
+    if [ "$wo_distro_codename" != "bookworm" ] && [ "$wo_distro_codename" != "trixie" ]; then
+        pip uninstall -yq wo wordops ee 2>/dev/null || true
     fi
 
     cd || exit 1