Rewrite ingested data reading to match MATLAB approach

The MATLAB-ingested data uses compressed segment files (ai_group*_seg.nbf_*)
read via ndicompress, and channel metadata from channel_list.bin. The
previous Python implementation tried to read a single VHSB data_file
which doesn't exist for MATLAB-ingested cloud data.

Key changes:
- getchannelsepoch_ingested: reads channel_list.bin via database_openbinarydoc
  (triggers ndic:// cloud fetch) and parses with mfdaq_epoch_channel
- samplerate_ingested: now returns (sr, offset, scale) tuple matching MATLAB,
  looks up channels by both type AND number
- readchannels_epochsamples_ingested: reads compressed segment files using
  ndicompress.expand_ephys/expand_digital/expand_time, handles segment
  arithmetic and channel group decoding
- epochsamples2times_ingested/epochtimes2samples_ingested: updated for
  new samplerate_ingested return signature

https://claude.ai/code/session_01A7rAxYf5pSvs19iVJe3ncL

Author: claude