Update scripts to use Debian 13 and improve update logic

Bump default container OS version from Debian 12 to 13 across multiple LXC setup scripts. Refactor update_script functions for consistency, improve messaging, and standardize apt usage. Update Kimai install and update scripts to use setup_php, setup_composer, and fetch_and_deploy_gh_release helpers, and switch from MySQL to MariaDB. Update Kometa to use Python 3.13. Minor improvements to backup, cleanup, and service management steps in several scripts.

misc/tools.func

@@ -1141,7 +1141,7 @@ function fetch_and_deploy_gh_release() {
       rm -rf "${target:?}/"*
     fi
 
-  tar --no-same-owner -xzf "$tmpdir/$filename" -C "$tmpdir" || {
+    tar --no-same-owner -xzf "$tmpdir/$filename" -C "$tmpdir" || {
       msg_error "Failed to extract tarball"
       rm -rf "$tmpdir"
       return 1