本次围绕外部 MCP（含 SSE 长连接）做了连接自愈：断连检测、状态修正、指数退避自动重连，并避免与手动停止或进行中的连接冲突；MCP 管理页增加定时刷新与断连原因展示。同时修复外部工具「常驻」在 tool_search 下不生效的问题（配置用 mcp::tool，运行时匹配 mcp__tool），监控页统一以双下划线展示工具名，与模型侧命名一致。
This update adds resilient external MCP handling (including SSE long-lived connections): dead-connection detection, corrected client state, and auto-reconnect with exponential backoff, while avoiding races with manual stop or in-flight connects; the MCP management UI now polls status and shows disconnect reasons. It also fixes external tools not staying “always visible” under tool_search (config uses mcp::tool, runtime matches mcp__tool), and aligns the monitor UI with model-facing mcp__tool names instead of internal mcp::tool.