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>

.env.example

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+# Copy to `.env` and fill in real values. Never commit `.env`.
+
+# --- SFTPGo credentials -----------------------------------------------
+# Whoever runs the event camera/laptop uploads photos here.
+SFTP_USER=livef12
+SFTP_PASSWORD=changeme
+
+# --- Host paths / ports --------------------------------------------------
+# On the server this should be an absolute path, e.g.
+# /home/frank/live.f12.rocks/data
+DATA_HOST_DIR=./data
+
+# Spec asked for 121212 which exceeds TCP max (65535). Use 12121.
+SFTP_HOST_PORT=12121
+
+# --- Pipeline tuning (see make_random.py for background) -----------------
+OUTPUT_COUNT=3
+BLEND_OPACITY=30%
+FILTER_TIMEOUT=120
+MAX_FILTER_ATTEMPTS=8
+NICE_LEVEL=18