feat(city): add player marketplace, mission journal, character customization and presence

- Player-to-player marketplace with listings, buying and selling
- Mission system with progress tracking and money rewards
- Character appearance customization (skin, hair, face, beard, accessory)
- Multiplayer presence feed showing nearby citizens in near-real-time
- Admin world dashboard with live platform metrics
- Bus and train transportation with temporary ride state
- Mobile joystick controls and minimap HUD
- Education bonus applied to work salary

scripts/backup.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# City10 database backup — run on the cloud host (cron recommended daily).
+set -euo pipefail
+cd "$(dirname "$0")/.."
+STAMP="$(date +%Y%m%d-%H%M%S)"
+mkdir -p storage/app/backups
+mysqldump --single-transaction --no-tablespaces \
+  -h"${DB_HOST:-127.0.0.1}" -P"${DB_PORT:-3306}" \
+  -u"${DB_USERNAME}" -p"${DB_PASSWORD}" \
+  "${DB_DATABASE}" | gzip > "storage/app/backups/city10-${STAMP}.sql.gz"
+echo "Backup written to storage/app/backups/city10-${STAMP}.sql.gz"