fix(docker): use PICOCLAW_HOME env var for volume paths in docker-compose.full.yml (#2269)

The docker-compose.full.yml had hardcoded /root/.picoclaw paths for volumes.
This caused issues when running containers with non-root users or custom
home directories.

Changes:
- Add PICOCLAW_HOME environment variable support (defaults to /root/.picoclaw)
- Use variable substitution in volume mounts for config.json and workspace
- Applied to both picoclaw-agent and picoclaw-gateway services

This allows users to override the home directory by setting PICOCLAW_HOME
environment variable before running docker compose.

docker/docker-compose.full.yml

@@ -10,9 +10,12 @@ services:
     container_name: picoclaw-agent-full
     profiles:
       - agent
+    environment:
+      # Allow overriding the default home directory via environment variable
+      - PICOCLAW_HOME=${PICOCLAW_HOME:-/root/.picoclaw}
     volumes:
-      - ../config/config.json:/root/.picoclaw/config.json:ro
+      - ../config/config.json:${PICOCLAW_HOME:-/root/.picoclaw}/config.json:ro
-      - picoclaw-workspace:/root/.picoclaw/workspace
+      - picoclaw-workspace:${PICOCLAW_HOME:-/root/.picoclaw}/workspace
       - picoclaw-npm-cache:/root/.npm # npm cache for faster MCP server installs
     entrypoint: ["picoclaw", "agent"]
     stdin_open: true
@@ -30,11 +33,14 @@ services:
     restart: unless-stopped
     profiles:
       - gateway
+    environment:
+      # Allow overriding the default home directory via environment variable
+      - PICOCLAW_HOME=${PICOCLAW_HOME:-/root/.picoclaw}
     volumes:
       # Configuration file
-      - ../config/config.json:/root/.picoclaw/config.json:ro
+      - ../config/config.json:${PICOCLAW_HOME:-/root/.picoclaw}/config.json:ro
       # Persistent workspace (sessions, memory, logs)
-      - picoclaw-workspace:/root/.picoclaw/workspace
+      - picoclaw-workspace:${PICOCLAW_HOME:-/root/.picoclaw}/workspace
       # NPM cache for faster MCP server installs
       - picoclaw-npm-cache:/root/.npm
     command: ["gateway"]