Changes:
1. UI: removed blocking prompt() that asked for artist+title on filename
that didn't match 'Artist - Title' pattern. Upload always proceeds.
Instead shows yellow warning saying 'server will try to recognize'.
2. Backend: added scripts/acr_recognize.py — extracts 20s audio sample
from video (at 15s and 60s offsets for robustness), computes ACRCloud
fingerprint via native binary (3KB payload), sends to identify API.
3. Pipeline: process_job() now runs ACR recognition step before analysis
IF parsed_artist or parsed_title is missing. Result is saved to job
metadata and used for download filename + Scribe/Claude filename hint.
4. Credentials: ACR_HOST + ACR_ACCESS_KEY + ACR_SECRET_KEY env vars
added to Coolify (using existing keys from openclaw fb-agent metka).
5. requirements.txt: added pyacrcloud==1.0.11 for native fingerprinting.
This unblocks future automation/cron upload pipelines — files don't need
to be perfectly named, ACRCloud will identify them automatically.
Fallback chain:
1. Filename parsing (Artist - Title.mp4)
2. ACRCloud audio fingerprint (works even for '12345.mp4', 'IMG_001.mp4')
3. If both fail: download filename uses 'reel_<id>.mp4' (still works)
