feat: challenge registry-driven platform + XVI/XVII imports + admin toggle + domain rename

- Rename repo/domain: attack-defense-platform / attackdefense.imrnes.team (all refs replaced)
- challenge_registry.json: single source of truth (28 challs across gemastik18/xvi/xvii)
- teams.py: registry-driven CHALLENGES, set_challenge_enabled, sync_challenge_runtime
  (apply enable/disable to live teams: build/up or stop/remove + receiver restart)
- compose_gen.py: render per-team compose from canonical per-challenge templates
  (image reuse, per-team ports 30xxx, flag mounts, passwords)
- gen_canonical_composes.py: canonical docker-compose.yml for all services
- import_new_challenges.py: import XVI/XVII services + EOL base image fixes
  (debian:buster→bookworm, node:14→20, python:3.7-slim→3.11)
- receiver: xvi package (10 checkers) + xvii package (12 generic checkers),
  Challenge base reads PASSWORD_<team_port> from env; gen_receiver_main.py
  generates per-team main.py from registry
- main.py: /api/challenges returns full registry; PATCH /api/challenges/<name>
  toggles enabled + applies to live teams
- index.html: 🏗️ Challenge Manager tab (toggle per challenge, grouped by set)
- SLA bonus now dynamic (all enabled challenges, not hardcoded 6)

services/back-to-basic/Dockerfile

@@ -0,0 +1,30 @@
+FROM ubuntu:24.04
+
+ARG PASSWORD
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN echo root:${PASSWORD} | chpasswd
+COPY apt-insecure.conf /etc/apt/apt.conf.d/99gemastik-insecure
+RUN apt-get -o Acquire::AllowInsecureRepositories=true update && apt-get install -y openssh-server lib32z1 xinetd cmake gcc curl
+RUN echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config
+RUN echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
+RUN service ssh start
+
+RUN useradd -m ctf
+
+WORKDIR /ctf
+
+RUN echo "Connection blocked" > /etc/banner_fail
+COPY ctf.xinetd /etc/xinetd.d/ctf
+COPY ./src/main.c ./
+COPY ./start.sh ./
+RUN gcc /ctf/main.c -no-pie -fno-stack-protector -Wl,-z,relro,-z,now -o /ctf/main
+RUN touch /flag.txt
+RUN chmod -R 755 /ctf
+RUN chmod +x /ctf/start.sh
+
+ENTRYPOINT []
+CMD ["/usr/sbin/xinetd", "-dontfork"]
+
+EXPOSE 8000