TLS transport: OpenSSL-based encrypted TCP
- New transport_tls.h/c: TLS server (server_create_tls, server_listen_tls) and client (client_connect_tls) using OpenSSL - protocol.c: io_set_ssl() + SSL_read/SSL_write in send_n_data/receive_n_data - transport_tcp.h: ssl/ssl_ctx fields added to Server/Client structs - config.h/c: use_tls, tls_cert, tls_key fields - client_cli.c: --tls, --cert, --key flags - server.c: --tls, --cert, --key, -p flags with TLS support - CMakeLists.txt: OpenSSL::SSL + OpenSSL::Crypto linkage - shell.nix: openssl added to buildInputs
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