Full rewrite on @cyanheads/mcp-ts-core. Replaces the single send_ntfy tool with a four-tool surface (publish, manage, fetch, emoji search), adds an ntfy://{topic} resource, and introduces the NTFY_SERVERS multi-server registry.

Breaking from 1.x. NTFY_API_KEY accepted as a deprecated alias for NTFY_AUTH_TOKEN. See changelog/2.0.x/2.0.0.md for full notes and the 1.x migration table.