## Summary
Every subscription now gets Stripe tax rates attached automatically via
Cashier.
## Changes
- `config/subscriptions.php`: new `tax_rates` array, env
`STRIPE_TAX_RATES` (comma-separated), default
`txr_1TPfzrLRCmKA3oWMNWmkQeq2`
- `app/Models/User.php`: `taxRates()` reads from config — Cashier picks
it up automatically on `newSubscription()` checkout + subscription
creation
- `tests/Feature/SubscriptionTest.php`: 2 tests
## Applies to
- New checkout sessions (`SubscriptionController::checkout`)
- New subscriptions created via Cashier
## Existing subscriptions
Not updated automatically. To sync:
```php
$user->subscription('default')->syncTaxRates();
```
## Notes
Using hard-coded tax rate IDs (not Stripe Tax auto-calc). Switch to
`Cashier::calculateTaxes()` later if desired.
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