Support multi-chain NFT wallet displays

[cristhianescobar]

Summary

• align the NFT client with the documented /v1/nft/songs multi-chain payload by decoding API DTOs and mapping them into the shared domain models
• persist multi-chain NFT metadata and allocations, then use those allocations to filter wallet detail content to the selected wallet
• update the Android library and wallet detail screens to show Ethereum and Cardano sections separately, and remove the unsupported wallet-detail Tokens card
• add wallet rename support updates and regression tests for allocation matching and multi-chain NFT response decoding

Testing

• ./gradlew spotlessCheck
• ./gradlew :shared:jvmTest --tests io.newm.shared.NFTAllocationSerializationTest --tests io.newm.shared.NFTSongResponseDecodingTest --tests io.newm.shared.NFTTrackWalletAllocationTest
• ./gradlew :android:app-newm:compileDevelopmentDebugKotlin