Add two pure in-memory MCP tools over the online host list. search_hosts filters by name/remark, IP, group and OS (all optional, AND-combined, ASCII case-insensitive substring match); get_host_detail returns one online host by id and answers -32602 for a missing/non-numeric id and -32002 for an unknown or offline id. Sync Mcp_Phase2_Design.md with the second-review corrections and the P2a implementation.
Co-Authored-By: deepseek-v4-pro
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