fix: add tini init to devpod to reap zombie bun processes

bun --watch spawns new processes on file changes but code-server (PID 1)
doesn't reap orphans, causing zombie accumulation and port conflicts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile.devpod

@@ -8,7 +8,7 @@ ENV PATH="/usr/local/bin:/root/.bun/bin:$PATH"
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl wget git openssh-server ca-certificates gnupg \
     build-essential unzip zip jq tmux zsh ripgrep \
-    postgresql-client redis-tools haproxy \
+    postgresql-client redis-tools haproxy tini \
     nano vim htop netcat-openbsd dnsutils iputils-ping \
     && rm -rf /var/lib/apt/lists/*
 
@@ -44,4 +44,4 @@ RUN chmod +x /entrypoint.sh
 
 WORKDIR /root
 EXPOSE 8080 22
-ENTRYPOINT ["/entrypoint.sh"]
+ENTRYPOINT ["/usr/bin/tini", "--", "/entrypoint.sh"]