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feat: add bb_tcp_client_get_host_port accessor (#1193)

Adds a public getter returning the configured endpoint (host and/or
port) of a bb_tcp_client instance, implemented in all three backends
(host, ESP-IDF, Arduino stub). cfg.host/cfg.port are set once at
bb_tcp_client_init() and never mutated afterward; this getter rests
on the component's single-writer-per-instance invariant (same basis
as bb_tcp_client_get_state()'s no-lock read), with the additional,
stronger guarantee that cfg is write-once-at-init.

Truncation decision: out_host is always NUL-terminated when requested
(via the canonical bb_strlcpy helper); if the configured host doesn't
fit in out_host_cap - 1 bytes, the copy is truncated-and-terminated
AND BB_ERR_NO_SPACE is returned -- truncation is a reported error,
never silent. Either output (host/port) may be omitted independently;
omitting both is a caller error. Covers the cap==1 (room only for the
NUL) edge and confirms a truncated host still leaves out_port
correctly populated.

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