feat: add agent-worker compose service for image build + fix port range

docker/docker-compose.yml

@@ -182,3 +182,15 @@ services:
       timeout: 5s
       retries: 3
       start_period: 20s
+
+  # ── Agent Worker (build-only, not started by default) ─────────────────────
+  # This service is used to build the agent-worker Docker image.
+  # Agent containers are created dynamically via `docker run` from the
+  # control-center when a user deploys an agent.
+  # Build: docker compose build agent-worker
+  agent-worker:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.agent-worker
+    image: goclaw-agent-worker:latest
+    # Not started by default — only used for building the image