refactor(docker): extract codex-acp version into ARG for consistency

Author: chaodu-agent

Dockerfile.codex

@@ -11,8 +11,9 @@ FROM node:22-bookworm-slim
 RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl procps ripgrep tini && rm -rf /var/lib/apt/lists/*
 
 # Pre-install codex-acp and codex CLI globally
+ARG CODEX_ACP_VERSION=0.11.1
 ARG CODEX_VERSION=0.121.0
-RUN npm install -g @zed-industries/codex-acp@0.11.1 @openai/codex@${CODEX_VERSION} --retry 3
+RUN npm install -g @zed-industries/codex-acp@${CODEX_ACP_VERSION} @openai/codex@${CODEX_VERSION} --retry 3
 
 # Install gh CLI
 RUN curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg \