Add currency conversion support for BOLT 12 offers#3833

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shaavan wants to merge 8 commits intolightningdevkit:mainfrom

shaavan:currency

Commits on Apr 3, 2026

[feat] Introduce the CurrencyConversion trait

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[test] Add CurrencyConversion amount conversion coverage

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[feat] Keep CurrencyConversion in ChannelManager

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[feat] Support fiat-denominated amounts in OfferBuilder

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[feat] Keep CurrencyConversion in InvoiceRequestBuilder

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[test] Add parsing coverage for explicit fiat request amounts

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[feat] Quote currency-denominated offer amounts in invoices

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[test] Cover currency-denominated invoice handling

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