docs: remove TrueNAS references, make volume paths platform agnostic

- compose.yml: generic /path/to/winnow/... placeholder paths
- docs/setup.md: replace TrueNAS section with generic GPU passthrough guide
- docs/faq.md: remove platform-specific path example
- README.md: soften crop quality disclaimer, remove TrueNAS compose note
- CHANGELOG.md: scrub TrueNAS mentions from release notes

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

compose.yml

@@ -52,10 +52,10 @@ services:
       # - CRON_SCHEDULE=0 3 1 * *
       # - CRON_SCHEDULE=*/30 * * * *
     volumes:
-      # Replace <pool> with your TrueNAS pool name, e.g. /mnt/tank/winnow/...
-      - /mnt/<pool>/winnow/models:/models
-      - /mnt/<pool>/winnow/embeddings:/app/.if_cache
-      - /mnt/<pool>/winnow/output:/app/frigate_train
+      # Replace with absolute paths on your host, e.g. /opt/winnow/models
+      - /path/to/winnow/models:/models
+      - /path/to/winnow/cache:/app/.if_cache
+      - /path/to/winnow/output:/app/frigate_train
     stdin_open: true
     tty: true
     restart: unless-stopped