Add automated backup system

- api/backup.php: list/create/download/delete backups; streams zip directly
  for downloads; 7-backup rolling prune on each create
- Each backup is a single zip containing all of public_html + a full
  mysqldump of tomt_ttg_db
- Cron at 2 AM daily via /usr/local/bin/ttg-backup.sh (already installed)
- Admin UI: 💾 Backups nav item under System section; shows backup list
  with date/size, Download + Delete per row; Create Backup Now button
  with live status; auto-loads when section is opened

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

scripts/ttg-backup.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# TomTomGames automated backup — runs daily at 2 AM via cron
+# Cron entry: 0 2 * * * /usr/local/bin/ttg-backup.sh >> /home/tomtomgames.com/backups/backup.log 2>&1
+
+BACKUP_DIR="/home/tomtomgames.com/backups"
+SITE_DIR="/home/tomtomgames.com/public_html"
+DB_NAME="tomt_ttg_db"
+DB_USER="tomt_ttg_user"
+DB_PASS='q#q+mrOcozsa7I6J'
+DATE=$(date +%Y-%m-%d_%H-%M-%S)
+SQL_FILE="/tmp/ttg_db_${DATE}.sql"
+ZIP_FILE="${BACKUP_DIR}/ttg_backup_${DATE}.zip"
+
+mkdir -p "$BACKUP_DIR"
+echo "[$(date '+%Y-%m-%d %H:%M:%S')] Starting backup..."
+
+# Export database
+/usr/bin/mysqldump -u "$DB_USER" "-p${DB_PASS}" "$DB_NAME" > "$SQL_FILE" 2>&1
+if [ $? -ne 0 ] || [ ! -s "$SQL_FILE" ]; then
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] ERROR: Database export failed"
+    rm -f "$SQL_FILE"
+    exit 1
+fi
+echo "[$(date '+%Y-%m-%d %H:%M:%S')] Database exported ($(du -sh "$SQL_FILE" | cut -f1))"
+
+# Create zip archive (site files + db dump)
+/usr/bin/zip -r "$ZIP_FILE" "$SITE_DIR" "$SQL_FILE" -x "*/backups/*" > /dev/null 2>&1
+RC=$?
+rm -f "$SQL_FILE"
+
+if [ $RC -ne 0 ] || [ ! -f "$ZIP_FILE" ]; then
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] ERROR: Archive creation failed"
+    rm -f "$ZIP_FILE"
+    exit 1
+fi
+echo "[$(date '+%Y-%m-%d %H:%M:%S')] Archive created: $(basename "$ZIP_FILE") ($(du -sh "$ZIP_FILE" | cut -f1))"
+
+# Keep only the 7 most recent backups
+ls -t "${BACKUP_DIR}"/ttg_backup_*.zip 2>/dev/null | tail -n +8 | while read old; do
+    rm -f "$old"
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] Pruned old backup: $(basename "$old")"
+done
+
+echo "[$(date '+%Y-%m-%d %H:%M:%S')] Backup complete."