fix(cli): Migration helper prints undefined variable and missing input validation

[Muawiya-contact]

crowd.dev edition

Community (self hosted)

Version

Latest (main branch)

What happened?

In scripts/cli, the create_migration() and
create_product_migration() functions have two bugs:

1. Final output prints $MIG_FILE which is never defined —
   should be $UP_MIG_FILE and $DOWN_MIG_FILE
2. No validation if migration name argument is empty,
   which silently creates broken files like V123456__ .sql

Command / Request

./scripts/cli create_migration

Relevant log output

Created  
# Empty output because $MIG_FILE is undefined
# Also creates a migration file with no name