Migrate exchange rate handling from static system settings to a
centralized `ExchangeRateService`. This change ensures that currency
rates are managed through a single source of truth that supports
history tracking, approval workflows, and API updates.
Laravel:
- Remove manual exchange rate fields (`aed_to_irr`, `usd_to_irr`, etc.)
from `IfnexSettingsPage` and the `SystemSetting` persistence logic.
- Update `PricingPageController` and `PriceCalculatorService` to
retrieve live rates from `ExchangeRateService` instead of `SystemSetting`.
- Refactor `IfnexSettingsPage` UI to display current rates as
read-only information with a link to the dedicated exchange rate
management resource.
Documentation:
- Update `CLIENT_DELIVERY.md` to reflect the change in exchange rate
management workflow.
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