fix(core): fix numalgo 2 DID exchange by using correct service class

[tarunvaddeSoul]

Summary

• didToNumAlgo2DidDocument was creating all services as base DidDocumentService instances instead of their proper subclass (e.g. DidCommV1Service), causing instanceof checks to fail
• This meant DidDocument.recipientKeys returned zero keys for numalgo 2 DIDs, breaking DID exchange when the requester uses numalgo 2
• Fix: use the existing serviceTypes mapping (same as ServiceTransformer) to instantiate the correct service class

Test plan

• All 8 didexchange-numalgo tests pass (2 were timing out before)
• peerDidNumAlgo2 resolution tests pass (fixture updated for priority field)
• pnpm types:check clean
• pnpm style:check clean

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Latest commit: 8c3140f

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