Map dAPI block and transaction queries to NEP-21 types

[Jim8y]

Summary

Fix audit P2-13: adapt verbose node JSON returned by dAPI getBlock and getTransaction to the NEP-21 query field names and types.

• Convert node field names to camelCase, and decode sender/next-consensus addresses to script hashes using the configured address version.
• Preserve atomic fee strings exactly, including values above JavaScript's safe-integer range; do not rescale them or round through floating point.
• Convert every nested transaction, supplying metadata from its enclosing block while leaving unconfirmed standalone metadata absent.
• Preserve signer restrictions, witness rules and unrelated response fields, without mutating the source RPC object.

Validation

• dotnet test tests/p2-13/OneGate.DapiQuery.Tests.csproj --no-restore --nologo: 11/11 passed. Fixtures use the application's Neo 3.10.0 serialization.
• iOS 26.5 simulator and Android API 36 arm64 emulator: 12 JavaScript assertions passed on each through the actual injected NEP-21 provider, native BridgeWebView, RpcServer, LaunchDAppPage, RpcClient, mapper and callback. Three responses retained matching IDs and completed real JS promises; the upstream sequence was getrawtransaction/getblock/getrawtransaction. Checks covered exact fees, field names, hashes, signer restrictions, nested metadata and unconfirmed transactions.
• Only upstream HTTP responses were controlled. The external fixture was removed before separate fixture-free product rebuild/install/launch checks on both platforms; normal Home/four tabs rendered with no OneGate app crash observed.
• Final tested source patch SHA-256: 479bae85c68333104a2ca1fffaa0a6d790872d940533765dd9e8b53f08ea785f; matched to both platform evidence sets before committing.

Limitations and integration

No live-chain query, signing, approval or broadcast was performed. Clients relying on nonstandard lowercase node fields must use the NEP-21 names; screenshots and QA fixtures remain outside the repository and are not attached here, and no hosted CI pass is claimed.

Independently based and validated on master@623603d; preserve solution project entries as a union and revalidate after integration rather than treating this as combined audit validation. This query-mapping change has no dependency on a bridge-origin authorization redesign.

[Copilot]

🟢 Approval recommended

The mapper changes are narrow, match the stated requirements, and are backed by targeted regression tests that validate immutability, fee precision, and nested-transaction metadata behavior.

Pull request overview

This PR addresses audit item P2-13 by introducing a mapper that adapts verbose Neo node RPC JSON from dAPI getBlock / getTransaction into NEP-21-aligned field names and types (camelCase names; sender/next-consensus decoded to UInt160 script hashes) while preserving fee string precision and leaving the source RPC JSON unmodified.

Changes:

• Added DapiQueryResponseMapper to deep-clone and transform getblock / getrawtransaction verbose results into NEP-21 query shapes (including nested tx metadata propagation from enclosing blocks).
• Wired the mapper into the dAPI surface in LaunchDAppPage for GetBlock and GetTransaction.
• Added a dedicated regression-test project (plus coverage runsettings and documentation) to validate field mapping, immutability, nested transaction behavior, and fee-string precision.

File summaries

File	Description
tests/p2-13/README.md	Documents the mapping contract, invariants (immutability, fee precision), and validation steps for P2-13 regression tests.
tests/p2-13/OneGate.DapiQuery.Tests.csproj	Adds a focused test project that links the production mapper and uses Neo 3.10.0 for fixtures.
tests/p2-13/DapiQueryResponseMapperTests.cs	Introduces unit tests covering field renames, address decoding, nested tx metadata propagation, and non-mutation guarantees.
tests/p2-13/coverage.runsettings	Adds coverage configuration targeting the mapper for the new test project.
OneGateApp/Services/RPC/DapiQueryResponseMapper.cs	Implements the RPC-to-NEP-21 JSON adaptation while preserving fee string precision and avoiding mutation of the input JSON.
OneGateApp/Pages/LaunchDAppPage.xaml.dAPI.cs	Updates dAPI GetBlock / GetTransaction to return mapped NEP-21-shaped responses.
OneGateApp.slnx	Registers the new P2-13 test project in the solution.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Lite

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