Add daily backup scripts for PostgreSQL, MariaDB, and Gitea.

Enable scheduled backups of ncue.net databases and git.ncue.net repository mirrors via .env-driven shell scripts.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

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+## Database (PostgreSQL)
+PG_DB_HOST=ncue.net
+PG_DB_PORT=5432
+PG_DB_NAME=ncue
+PG_DB_USER=ncue
+PG_DB_PASSWORD=your_pg_password
+
+## Database (MariaDB)
+MR_DB_HOST=ncue.net
+MR_DB_PORT=3306
+MR_DB_NAME=wordpress
+MR_DB_USER=ncue
+MR_DB_PASSWORD=your_mr_password
+
+## Gitea
+GIT_BASE_URL=https://git.ncue.net
+GIT_USER=your_gitea_user
+GIT_TOKEN=your_gitea_token
+
+## Backup
+BACKUP_DIR=/Users/dsyoon/workspace/backup/ncue
+BACKUP_RETENTION_DAYS=30
+
+## PostgreSQL backup options
+PG_BACKUP_SCOPE=all
+PG_BACKUP_GLOBALS=1
+PG_BACKUP_SUPERUSER=postgres
+PG_BACKUP_SUPERUSER_PASSWORD=
+
+## MariaDB backup options
+MR_BACKUP_SCOPE=all
+
+## Gitea backup options
+GITEA_REPO_LIMIT=100