feat: OpenClaw WebSocket integration with workspace file preview

- Migrate OpenClaw from HTTP (port 8004) to WebSocket (port 18789)
- Add workspace file list and content preview handlers
- Add OpenClawStatus component with agent/skills view
- Add OpenClawView panel in trader interface
- Add Zustand store for OpenClaw state management
- Fix gateway logging noise (yfinance, websockets)
- Fix RunWorkspaceManager.get_agent_asset_dir attribute error
- Handle missing workspace files gracefully in preview

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

start-dev.sh

@@ -57,6 +57,16 @@ cleanup() {
     fi
 }
 
+kill_port() {
+    local port="$1"
+    local pids=$(lsof -ti :${port} 2>/dev/null || true)
+    if [ -n "$pids" ]; then
+        echo -e "${YELLOW}Port ${port} is in use, killing PID(s): ${pids}${NC}"
+        echo "$pids" | xargs kill -9 2>/dev/null || true
+        sleep 0.5
+    fi
+}
+
 trap cleanup EXIT INT TERM
 
 if [ $# -gt 0 ]; then
@@ -67,11 +77,13 @@ fi
 export TRADING_SERVICE_URL="${TRADING_SERVICE_URL:-http://localhost:8001}"
 export NEWS_SERVICE_URL="${NEWS_SERVICE_URL:-http://localhost:8002}"
 export RUNTIME_SERVICE_URL="${RUNTIME_SERVICE_URL:-http://localhost:8003}"
+export OPENCLAW_SERVICE_URL="${OPENCLAW_SERVICE_URL:-http://localhost:18789}"
 
 echo ""
 echo -e "${GREEN}Starting EvoTraders split services (default mode)...${NC}"
 echo "  agent_service:   http://localhost:8000"
 echo "  runtime_service: http://localhost:8003"
+echo "  openclaw_gateway:  ws://localhost:18789"
 echo "  trading_service: http://localhost:8001"
 echo "  news_service:    http://localhost:8002"
 echo ""
@@ -79,13 +91,28 @@ echo "Exported backend preference URLs:"
 echo "  TRADING_SERVICE_URL=${TRADING_SERVICE_URL}"
 echo "  NEWS_SERVICE_URL=${NEWS_SERVICE_URL}"
 echo "  RUNTIME_SERVICE_URL=${RUNTIME_SERVICE_URL}"
+echo "  OPENCLAW_SERVICE_URL=${OPENCLAW_SERVICE_URL}"
 echo ""
 
+echo -e "${GREEN}Checking ports...${NC}"
+kill_port 8000
+kill_port 8001
+kill_port 8002
+kill_port 8003
+kill_port 8765
+
 start_service "agent_service" "backend.apps.agent_service:app" 8000
 start_service "runtime_service" "backend.apps.runtime_service:app" 8003
 start_service "trading_service" "backend.apps.trading_service:app" 8001
 start_service "news_service" "backend.apps.news_service:app" 8002
 
+echo -e "${GREEN}Starting Gateway (WebSocket, port 8765)...${NC}"
+SERVICE_NAME="gateway" python -m backend.main \
+    --mode live \
+    --host 0.0.0.0 \
+    --port 8765 &
+PIDS+=($!)
+
 echo -e "${GREEN}Split services are running.${NC}"
 echo "Use Ctrl+C to stop all services."
 wait