Generate a PhoenixKit versioned migration for the parent application.
Scans existing migrations in priv/repo/migrations/ to determine the current
PhoenixKit version, then generates a migration that upgrades to the latest version.
Usage
mix phoenix_kit.gen.migrationOptions
--prefix- Database schema prefix (default: "public")
Examples
# Generate upgrade migration with default prefix
mix phoenix_kit.gen.migration
# Generate with custom schema prefix
mix phoenix_kit.gen.migration --prefix my_schema