chore: add mflux model download script for off-peak scheduling

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

scripts/mflux-download-model.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Download Flux Schnell model (~12 GB) and start mflux-service.
+# Schedule via: at 23:30 < scripts/mflux-download-model.sh
+# Or:  echo "bash /Users/benjaminadmin/Projekte/breakpilot-lehrer/scripts/mflux-download-model.sh" | at 23:30
+
+LOG="/tmp/mflux-download.log"
+VENV="$HOME/mflux-env"
+SCRIPT="$HOME/Projekte/breakpilot-lehrer/scripts/mflux-service.py"
+
+echo "$(date): Starting Flux Schnell model download..." >> "$LOG"
+
+# Generate a test image to trigger model download
+"$VENV/bin/mflux-generate" \
+  --model schnell \
+  --prompt "test" \
+  --steps 2 \
+  --width 256 --height 256 \
+  -o /tmp/mflux-test.png \
+  >> "$LOG" 2>&1
+
+echo "$(date): Model download complete. Starting mflux-service..." >> "$LOG"
+
+# Start the service
+nohup "$VENV/bin/python" "$SCRIPT" >> "$LOG" 2>&1 &
+
+echo "$(date): mflux-service started (PID $!)." >> "$LOG"