feat: add GIF Mood Board workshop

- New workshop where each team member shares up to 5 GIFs with notes to express their weekly mood
- Per-user week rating (1-5 stars) visible next to each member's section
- Masonry-style grid with adjustable column count (3/4/5) toggle
- Handwriting font (Caveat) for GIF notes
- Full real-time collaboration via SSE
- Clean migration (add_gif_mood_workshop) safe for production deploy
- DB backup via cp before each migration in docker-entrypoint

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

docker-entrypoint.sh

@@ -1,6 +1,19 @@
 #!/bin/sh
 set -e
 
+DB_PATH="/app/data/dev.db"
+BACKUP_DIR="/app/data/backups"
+
+if [ -f "$DB_PATH" ]; then
+  mkdir -p "$BACKUP_DIR"
+  BACKUP_FILE="$BACKUP_DIR/dev-$(date +%Y%m%d-%H%M%S).db"
+  cp "$DB_PATH" "$BACKUP_FILE"
+  echo "💾 Database backed up to $BACKUP_FILE"
+
+  # Keep only the 10 most recent backups
+  ls -t "$BACKUP_DIR"/*.db 2>/dev/null | tail -n +11 | xargs rm -f
+fi
+
 echo "🔄 Running database migrations..."
 pnpm prisma migrate deploy