Parse FASTA text into named sequence entries. Handles multi-line sequences, multiple records, and raw sequence without a header (auto-named seq_1, seq_2, ...). Use to turn a pasted or downloaded FASTA into the input for covabio_batch_profile or any single-sequence tool.

Parameters:
  fasta_text: FASTA-formatted text (one or more records).

Returns: {entries: [{name, sequence}]}