- log.py: _redact_blobs() recursively truncates data-URI / base64 fields
  (init_image, image, mask, character_references, …) to their first 48 chars
  in the FULL REQUEST DEBUG dump, so a clip request no longer prints tens of KB
  of base64. Prompts and normal fields are left intact (base64-charset check
  excludes anything with spaces/punctuation).
- requirements.txt: add ftfy (required by the diffusers Wan/T5 prompt_clean
  path; its absence surfaced as "name 'ftfy' is not defined" at generation).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>