dcdpr / jp / 20598700984

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perf(mcp): use `RwLock` for `Client` servers and services (#342)

Replace `tokio::sync::Mutex` with `tokio::sync::RwLock` for the
`servers` and `services` collections in the MCP `Client`.

This change allows multiple concurrent readers to access server
configurations and running services simultaneously, reducing lock
contention during parallel tool lookups or resource listings. Exclusive
write access is now only required when starting or stopping services.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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