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Add POST /set_sdr_lna_gain endpoint. Add an LNA Gain input+Set button to the SDR settings row, styled identically to RF Gain. The control is hidden until the server reports a sdr_lna_gain_db value (i.e. devices that expose an LNA gain element). AGC disables it alongside RF Gain. Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>