## What
Add the Singapore Dollar as a supported currency.
## Compatibility
Provider covers `sgd` (standard ISO 4217). The conversion service
lowercases codes and fetches `sgd.min.json` — same path RSD/NZD use.
`exchange_rates` stores rates as JSON, so any 3-letter code works.
Validation rules and Inertia currency props auto-derive from config.
## Changes
- `config/currencies.php` — SGD entry (`allows_primary` +
`allows_account`)
- `lang/es.json` — Spanish translation
- `lang/fr.json` — French translation
- `resources/js/utils/currency.ts` — short symbol (S$) for SGD
Follows the RSD addition (#567) exactly; no code changes needed.
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