feat: initial live.f12.rocks SFTP → gmic/rembg → web pipeline

Event pep stack with SFTPGo inbox, sequential worker, FastAPI gallery/remix, and Traefik-ready compose.

Co-authored-by: Cursor <cursoragent@cursor.com>

NOTES.md

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+# NOTES.md
+
+## Deploy 2026-07-16
+
+- Live on boka: `/home/frank/live.f12.rocks`
+- Web: https://live.f12.rocks
+- SFTP: `livef12@frank-schwenk.de` port **12121** (spec 121212 is invalid TCP)
+- Password in server `.env` only (`chmod 600`); ntfy sent to phone
+- Data: `/home/frank/live.f12.rocks/data` (inbox not auto-cleaned)
+- First rembg job downloads ~176 MB model into docker volume `rembg_cache`