fix: pass std::string to Poco::format for %s args - #500
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Poco::format with %s can misbehave on transient C string pointers and arrays that may be overwritten; pass std::string copies instead. Applies to error/status logs in the linux and macos tun implementations.
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strerror returns a transient char* pointing to a static buffer that can be overwritten by subsequent calls; pass std::string(strerror(...)) to Poco::format so %s formats a stable copy.