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feat: parse and persist optional hostname in wifi_prov's /save form (B1-809) (#1115)

- bb_wifi_prov_parse_body() extends its signature with a hostname_out
  buffer, decoded the same way as ssid/pass via bb_url_decode_field;
  absent/empty is not an error and never changes the existing
  OK/EMPTY_BODY/SSID_REQUIRED results.
- prov_save_handler persists a non-empty hostname via the existing
  bb_settings_hostname_set(), which already owns RFC-1123 validation.
  An invalid hostname is logged and discarded rather than failing the
  request -- creds are the important part of this form, so a bad
  hostname degrades to "hostname unchanged", never a 400 that strands
  the user with no creds saved.
- the hostname write is deliberately a separate, non-atomic single-key
  write from bb_settings_wifi_set()'s staged creds commit -- a
  half-write is recoverable (creds saved + prior/default hostname).


Claude-Session: https://claude.ai/code/session_01KM3KoyubaoM6eoUAsw8GYr

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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