dangernoodle-io / breadboard / 24949631592

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feat(bb_wifi): add bb_wifi_set_hostname for DHCP option 12 (#87)

wraps esp_netif_set_hostname on the STA netif so consumers can
advertise a host name in DHCP discover/request. routers populate
their client/lease tables with this value.

independent of bb_mdns — consumers that want the same value on
both surfaces call both bb_wifi_set_hostname and
bb_mdns_set_hostname. no cross-component dependency.

- validates non-NULL non-empty input
- returns BB_ERR_INVALID_STATE if STA netif not yet initialized
- host/arduino stubs return BB_OK (no DHCP host name surface there)

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