getPackageShippingCost returns Packlink API price in service currency without converting to cart currency

[matteolavaggi]

Summary

• Add ShippingCostCurrencyConverter to convert Packlink API/service prices from the shipping method currency to the cart currency using PrestaShop conversion_rate (same logic as Tools::convertPriceFull, without requiring front-office context).
• Update PackageCostCalculator to convert costs on every return path before applying shop free-shipping settings.
• Update SystemInfoService::getCurrencies() to return all enabled shop currencies via Currency::getCurrenciesByIdShop() instead of only PS_CURRENCY_DEFAULT.

Environment

• PrestaShop 1.7 / 8 / 9 with multiple currencies enabled
• Shop default currency: EUR
• Customer checkout currency: e.g. NOK, SEK, GBP (any non-default)
• Packlink PRO PrestaShop module 3.5.x / 3.6.0

Steps to reproduce

1. Enable a secondary currency (e.g. NOK) in PrestaShop.
2. Customer selects NOK at checkout and a Norway delivery address.
3. Packlink carrier is available; API returns rates in EUR (e.g. FedEx base_price: 17.96, currency: EUR).
4. Complete order.

Expected

Shipping cost shown and stored in cart currency (NOK), e.g. ~194 NOK for 17.96 EUR (using PS conversion_rate).

Actual (before fix)

EUR amount is passed to PrestaShop unchanged and displayed/stored as NOK, e.g. 23.35 NOK instead of ~252 NOK.

Root cause

PackageCostCalculator::getPackageCost() returns ShippingCostCalculator / API costs without converting from the shipping method currency to $cart->id_currency.

SystemInfoService::getCurrencies() only exposes PS_CURRENCY_DEFAULT, not all shop currencies — related for multi-currency misconfiguration handling.

Verification

// Order with id_currency = NOK, Packlink API FedEx base_price 17.96 EUR
// Before fix: PackageCostCalculator returns ~23.35
// After fix:  returns ~194.20 NOK (rate-dependent)

Manual test:

1. Enable a non-default checkout currency (e.g. NOK) with a realistic conversion_rate vs EUR.
2. Place a test order with a Packlink carrier whose API rate is returned in EUR.
3. Confirm checkout shipping cost and order total use the converted NOK amount, not the raw EUR value.

Test plan

• Checkout with cart currency = default (EUR): shipping cost unchanged
• Checkout with cart currency = secondary (e.g. NOK): cost converted from service currency
• Backup carrier path: min cost computed after per-method conversion
• Packlink admin system info lists all enabled shop currencies

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