refactor(ssh): consolidate real_ssh into ssh, remove duplication

real_ssh was a separate service name pointing to the same template and
behaviour as ssh. Merged them: ssh is now the single real-OpenSSH service.

- Rename templates/real_ssh/ → templates/ssh/
- Remove decnet/services/real_ssh.py
- Deaddeck archetype updated: services=["ssh"]
- Merge test_real_ssh.py into test_ssh.py (includes deaddeck + logging tests)
- Drop decnet.services.real_ssh from test_build module list

templates/ssh/Dockerfile

@@ -0,0 +1,76 @@
+ARG BASE_IMAGE=debian:bookworm-slim
+FROM ${BASE_IMAGE}
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    openssh-server \
+    sudo \
+    rsyslog \
+    curl \
+    wget \
+    vim \
+    nano \
+    net-tools \
+    procps \
+    htop \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /var/run/sshd /root/.ssh /var/log/decnet
+
+# sshd_config: allow root + password auth
+RUN sed -i \
+    -e 's|^#\?PermitRootLogin.*|PermitRootLogin yes|' \
+    -e 's|^#\?PasswordAuthentication.*|PasswordAuthentication yes|' \
+    -e 's|^#\?ChallengeResponseAuthentication.*|ChallengeResponseAuthentication no|' \
+    /etc/ssh/sshd_config
+
+# rsyslog: forward auth.* and user.* to named pipe in RFC 5424 format.
+# The entrypoint relays the pipe to stdout for Docker log capture.
+RUN printf '%s\n' \
+    '# DECNET log bridge — auth + user events → named pipe as RFC 5424' \
+    '$template RFC5424fmt,"<%PRI%>1 %TIMESTAMP:::date-rfc3339% %HOSTNAME% %APP-NAME% %PROCID% %MSGID% %STRUCTURED-DATA% %msg%\n"' \
+    'auth,authpriv.*  |/var/run/decnet-logs;RFC5424fmt' \
+    'user.*           |/var/run/decnet-logs;RFC5424fmt' \
+    > /etc/rsyslog.d/99-decnet.conf
+
+# Silence default catch-all rules so we own auth/user routing exclusively
+RUN sed -i \
+    -e 's|^\(\*\.\*;auth,authpriv\.none\)|#\1|' \
+    -e 's|^auth,authpriv\.\*|#auth,authpriv.*|' \
+    /etc/rsyslog.conf
+
+# Sudo: log to syslog (auth facility) AND a local file with full I/O capture
+RUN echo 'Defaults logfile="/var/log/sudo.log"' >> /etc/sudoers && \
+    echo 'Defaults syslog=auth'                >> /etc/sudoers && \
+    echo 'Defaults log_input,log_output'       >> /etc/sudoers
+
+# Lived-in environment: motd, shell aliases, fake project files
+RUN echo "Ubuntu 22.04.3 LTS" > /etc/issue.net && \
+    echo "Welcome to Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-88-generic x86_64)" > /etc/motd && \
+    echo "" >> /etc/motd && \
+    echo " * Documentation:  https://help.ubuntu.com" >> /etc/motd && \
+    echo " * Management:     https://landscape.canonical.com" >> /etc/motd && \
+    echo " * Support:        https://ubuntu.com/advantage" >> /etc/motd
+
+RUN echo 'alias ll="ls -alF"' >> /root/.bashrc && \
+    echo 'alias la="ls -A"'   >> /root/.bashrc && \
+    echo 'alias l="ls -CF"'   >> /root/.bashrc && \
+    echo 'export HISTSIZE=1000' >> /root/.bashrc && \
+    echo 'export HISTFILESIZE=2000' >> /root/.bashrc && \
+    echo 'PROMPT_COMMAND='"'"'logger -p user.info -t bash "CMD uid=$UID pwd=$PWD cmd=$(history 1 | sed "s/^ *[0-9]* *//")";'"'" >> /root/.bashrc
+
+# Fake project files to look lived-in
+RUN mkdir -p /root/projects /root/backups /var/www/html && \
+    printf '# TODO: migrate DB to new server\n# check cron jobs\n# update SSL cert\n' > /root/notes.txt && \
+    printf 'DB_HOST=10.0.0.5\nDB_USER=admin\nDB_PASS=changeme123\nDB_NAME=prod_db\n' > /root/projects/.env && \
+    printf '[Unit]\nDescription=App Server\n[Service]\nExecStart=/usr/bin/python3 /opt/app/server.py\n' > /root/projects/app.service
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 22
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD kill -0 1 || exit 1
+
+ENTRYPOINT ["/entrypoint.sh"]