fix: restore brainstorming feature with missing socket server and real-time events

docker-compose.yml

@@ -88,6 +88,32 @@ services:
           cpus: '0.5'
           memory: 512M
 
+  # ============================================
+  # memento-socket - Socket.io Real-time Server
+  # ============================================
+  memento-socket:
+    build:
+      context: ./memento-note
+      dockerfile: ${MEMENTO_SOCKET_DOCKERFILE:-Dockerfile.socket}
+    container_name: memento-socket
+    env_file:
+      - .env.docker
+    ports:
+      - "3002:3002"
+    environment:
+      - NODE_ENV=production
+    restart: unless-stopped
+    networks:
+      - memento-network
+    deploy:
+      resources:
+        limits:
+          cpus: '1'
+          memory: 512M
+        reservations:
+          cpus: '0.25'
+          memory: 128M
+
   # ============================================
   # mcp-server - MCP Protocol Server
   # ============================================