chore(docker): update docker-compose to use pre-built image and bind mount

- Use docker.io/sipeed/picoclaw:latest instead of building locally
- Replace named volume with bind mount ./data:/root/.picoclaw
- Move docker-compose.yml into docker/ directory

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker/docker-compose.yml

@@ -1,12 +1,10 @@
 services:
   # ─────────────────────────────────────────────
   # PicoClaw Agent (one-shot query)
-  #   docker compose run --rm picoclaw-agent -m "Hello"
+  #   docker compose -f docker/docker-compose.yml run --rm picoclaw-agent -m "Hello"
   # ─────────────────────────────────────────────
   picoclaw-agent:
-    build:
-      context: .
-      dockerfile: Dockerfile
+    image: docker.io/sipeed/picoclaw:latest
     container_name: picoclaw-agent
     profiles:
       - agent
@@ -14,20 +12,17 @@ services:
     #extra_hosts:
     #  - "host.docker.internal:host-gateway"
     volumes:
-      - ./config/config.json:/home/picoclaw/.picoclaw/config.json:ro
-      - picoclaw-workspace:/home/picoclaw/.picoclaw/workspace
+      - ./data:/root/.picoclaw
     entrypoint: ["picoclaw", "agent"]
     stdin_open: true
     tty: true
 
   # ─────────────────────────────────────────────
   # PicoClaw Gateway (Long-running Bot)
-  #   docker compose up picoclaw-gateway
+  #   docker compose -f docker/docker-compose.yml up picoclaw-gateway
   # ─────────────────────────────────────────────
   picoclaw-gateway:
-    build:
-      context: .
-      dockerfile: Dockerfile
+    image: docker.io/sipeed/picoclaw:latest
     container_name: picoclaw-gateway
     restart: unless-stopped
     profiles:
@@ -36,11 +31,4 @@ services:
     #extra_hosts:
     #  - "host.docker.internal:host-gateway"
     volumes:
-      # Configuration file
-      - ./config/config.json:/home/picoclaw/.picoclaw/config.json:ro
-      # Persistent workspace (sessions, memory, logs)
-      - picoclaw-workspace:/home/picoclaw/.picoclaw/workspace
-    command: ["gateway"]
-
-volumes:
-  picoclaw-workspace:
+      - ./data:/root/.picoclaw