chore: rename package to toadfix/minishop

fix: auto-load package migrations so host app tests find permissions …

…table

publishesMigrations() alone does not load migrations — it only registers them
for publishing. The host app's php artisan migrate never ran the package
permission/schema tables, causing every test that seeds RoleAndPermissionSeeder
to fail with "no such table: permissions".

Added loadMigrationsFrom() alongside publishesMigrations() so migrations run
automatically in any host app (including CI) while still allowing host apps to
publish and customise them when needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>