photo-enhance: add EXIF auto-rotate and fix ComfyUI cache bypass

- Auto-orient photos before uploading: creates a temp -auto-orient copy
  via magick, uploads that to ComfyUI (which strips EXIF), deletes temp
  after upload. Output images are always correctly oriented.

- Bust ComfyUI execution cache: inject a random filename_prefix into
  SaveImage node on each submission. Without this, resubmitting the same
  image returns execution_cached with empty outputs {}, causing
  wait_for_output to spin until the 600s timeout.

- Detect and raise on cached-but-empty completions: if ComfyUI reports
  completed=true/success but outputs={}, raise immediately rather than
  polling until timeout (fallback safety net for edge cases).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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