feat(docker): add Compose deployment support

docker/.env.example

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+# =============================================================================
+# Codeman Docker Compose environment template
+# Copy this file to .env and set the values for the Docker host.
+# =============================================================================
+
+TZ=Australia/Perth
+
+# Optional overrides for direct `docker compose` use. The Bash start script
+# detects these values from CODEMAN_APPDATA_PATH automatically. Compose uses
+# 1000:1000 when the variables are omitted.
+# PUID=1000
+# PGID=1000
+
+# Name of the account that runs Codeman and all local CLI sessions. Changing
+# this value rebuilds the image with a matching account.
+CODEMAN_RUNTIME_USER=opencode
+
+# Required. Persistent Codeman application data, CLI credentials, and session
+# state are stored here on the host and mounted at the runtime account's home
+# directory in the container.
+CODEMAN_APPDATA_PATH=/mnt/user/appdata/Coding/codeman
+
+# Required for Docker cases. This must be an absolute path on the Docker host.
+# Codeman and each isolated case use this same path, so it cannot be a
+# container-only path such as /home/opencode/codeman-cases.
+CODEMAN_CASES_PATH=/mnt/user/appdata/Coding/codeman/codeman-cases
+
+# Required. Network bind address, host port, and local image tag.
+CODEMAN_HOST=0.0.0.0
+CODEMAN_PORT=3000
+CODEMAN_IMAGE=codeman:local
+
+# Required for any network-accessible Codeman instance. Use a unique, strong
+# password. This file is safe to commit; copy it to .env and set the value.
+CODEMAN_PASSWORD=changeme
+
+# Required. Username for Codeman HTTP Basic authentication.
+CODEMAN_USERNAME=admin
+
+# Optional: authenticate Gemini CLI without an interactive login.
+GEMINI_API_KEY=
+
+# Linux default. On Docker Desktop, use the socket path supported by your
+# Docker installation when it differs from /var/run/docker.sock.
+DOCKER_SOCKET=/var/run/docker.sock
+
+# Optional override for direct `docker compose` use. The Bash start script
+# detects this from DOCKER_SOCKET automatically. The direct Compose default is
+# 999, but the correct value depends on the Docker host.
+# DOCKER_SOCKET_GID=999
+
+# Set to 1 only when Docker-case hook callbacks are required.
+CODEMAN_DOCKER_BRIDGE_HOOKS=0
+
+# Set to 1 when `docker info` reports `SwapLimit=false`. The case memory limit
+# remains active; Codeman omits --memory-swap and filters the daemon's exact
+# unsupported-swap warning while preserving all other Docker create errors.
+CODEMAN_DOCKER_DISABLE_SWAP_LIMIT=0
+
+# Required only when applying the macvlan example in README.md.
+CODEMAN_MACVLAN_NETWORK=br0.11
+CODEMAN_IPV4_ADDRESS=10.10.11.236
+CODEMAN_MAC_ADDRESS=02:10:11:00:00:EC
+
+# Required only when creating a new managed macvlan network, rather than using
+# the external-network macvlan example.
+CODEMAN_MACVLAN_PARENT=br0.11
+CODEMAN_MACVLAN_SUBNET=10.10.11.0/24
+CODEMAN_MACVLAN_GATEWAY=10.10.11.1