feat: 重构项目心跳数据结构并实现相关功能

- 重构Redis心跳数据结构，使用统一的项目列表键
- 新增数据迁移工具和API端点
- 更新前端以使用真实项目数据
- 添加系统部署配置和文档
- 修复代码格式和样式问题

deploy/systemd/bls-project-console.service

@@ -0,0 +1,23 @@
+# Copy to: /etc/systemd/system/bls-project-console.service
+# Then: systemctl daemon-reload && systemctl enable --now bls-project-console
+
+[Unit]
+Description=BLS Project Console (Node/Express)
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/vol1/1000/Docker/nginx/project/bls/bls_project_console
+
+# Use repo .env (copy .env.example -> .env)
+EnvironmentFile=/vol1/1000/Docker/nginx/project/bls/bls_project_console/.env
+Environment=NODE_ENV=production
+
+# Node 22 is installed on host. If node path differs, replace /usr/bin/node.
+ExecStart=/usr/bin/node src/backend/server.js
+
+Restart=always
+RestartSec=2
+
+[Install]
+WantedBy=multi-user.target