Teach the systemd installer to install required Debian/Ubuntu
packages by default, with an opt-out for users who manage system
dependencies themselves.
Add explicit MariaDB install-extra handling so native installs can
pull in both the Python extra and required client build packages.
Slim down the README to production setup and operations, and move
development, Docker, migration helper, and architecture notes into
docs/development.md.
Expand the systemd installer so it can perform a complete native
installation with sensible defaults: copy the checkout into the target
app directory, create runtime directories, write the environment file,
install dependencies, configure systemd units, and optionally configure
nginx.
Add a staff-only Django self-check page that verifies runtime settings,
required binaries, writable paths, database connectivity, global config
state, and systemd service status when available.
Document installer overrides and expose the self-check from the main
navigation.
Make native systemd services the recommended production path for
pobsync while keeping Docker Compose available for development and
optional test installs.
Add web, worker, and scheduler systemd unit templates, a native
environment example, an optional nginx reverse proxy template, and an
installer that creates the venv, service user, env file, units, and
runs migrations/static collection.
Allow native deployments to configure POBSYNC_BACKUP_ROOT directly and
document the new production layout and update flow.
