Add migration script and harden module deploy SQL

- add scripts/migrate-stack.sh to export module images and sync project/storage to a remote host
  - ensure manage-modules-sql.sh applies module db-world/db-auth/db-characters and custom SmartAI fixes idempotently
  - stage AutoBalance configs with EndGameBoost disabled on every deploy
  - bump MySQL tmpfs size (MYSQL_RUNTIME_TMPFS_SIZE, default 8G) to avoid OOM/ENOSPC

compose.yml

@@ -23,7 +23,7 @@ services:
       - ${STORAGE_PATH:-./storage}/mysql-data:/var/lib/mysql-persistent
       - ${HOST_BACKUP_PATH:-${STORAGE_PATH:-./storage}/backups}:/backups
     tmpfs:
-      - /var/lib/mysql-runtime:size=2G
+      - /var/lib/mysql-runtime:size=${MYSQL_RUNTIME_TMPFS_SIZE:-8G}
     command:
       - mysqld
       - --datadir=/var/lib/mysql-runtime