Update start.sh with virtual environment support

start.sh

@@ -3,10 +3,21 @@
 
 echo "🦞 启动龙虾舰队监控中心..."
 
+# 检查并创建虚拟环境
+if [ ! -d "code/backend/venv" ]; then
+    echo "📦 创建 Python 虚拟环境..."
+    cd code/backend
+    python3 -m venv venv
+    source venv/bin/activate
+    pip install -r requirements.txt
+    cd ../..
+fi
+
 # 启动后端
 echo "📡 启动 Django 后端..."
 cd code/backend
-python3 manage.py runserver 0.0.0.0:8000 &
+source venv/bin/activate
+python manage.py runserver 0.0.0.0:8000 &
 BACKEND_PID=$!
 
 # 等待后端启动
@@ -24,6 +35,7 @@ echo ""
 echo "访问地址:"
 echo "  前端：http://localhost:3000"
 echo "  后端 API: http://localhost:8000/api/"
+echo "  API 测试：http://localhost:8000/api/lobsters/"
 echo ""
 echo "按 Ctrl+C 停止服务"