Add MongoDB database backup documentation

[Copilot]

Documentation only covered configuration backups (/config export), not the MongoDB database containing voice tracking stats, quotes, and user data.

Changes

README.md - Configuration Backup & Restore section:

• Added database backup using mongodump
• Added restore procedure using mongorestore --drop
• Note on --drop flag preventing data conflicts during restoration
• Complete backup workflow (config + database)

TROUBLESHOOTING.md:

• New "Database Backup and Restore" section with automated backup script
• Updated "Settings Not Persisting" to include database backup/restore
• Updated "Complete Reset" emergency procedure with full data recovery

Example

# Backup
docker-compose exec mongodb mongodump --archive=/data/db/backup.archive --db=koolbot
docker cp koolbot-mongodb:/data/db/backup.archive ./koolbot-backup-$(date +%Y%m%d).archive

# Restore
docker cp ./koolbot-backup-YYYYMMDD.archive koolbot-mongodb:/data/db/restore.archive
docker-compose exec mongodb mongorestore --archive=/data/db/restore.archive --db=koolbot --drop
docker-compose restart bot

Automated backup script example included for cron scheduling with retention policy.

Original prompt

Uppdate documentation to help making a backup of the database not just the config

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