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

server/agents.ts

@@ -409,7 +409,7 @@ export async function deployAgentContainer(agentId: number): Promise<{
     };
 
   const containerName = `goclaw-agent-${agentId}`;
-  const servicePort = 8001 + ((agentId - 1) % 999);
+  const servicePort = 8100 + ((agentId - 1) % 900); // Ports 8100-8999
   const containerImage =
     (agent as any).containerImage || "goclaw-agent-worker:latest";