Remove DashSync Coinbase transaction metadata tail

[llbartekll]

Summary

• replace Coinbase transaction tagging and metadata reads from DWEnvironment with an active-wallet SwiftDashSDK snapshot
• add wallet-scoped deterministic receive matching, prevent transaction reuse, and invalidate metadata cache on SDK and wallet events
• remove unused DSTransaction and DSAccount categories plus stale bridging/project references
• add focused resolver, byte-order, wallet-isolation, icon, and stale-cache tests
• update the DashSync migration and teardown ledgers

Verification

• focused Coinbase test bundle builds successfully
• dashpay arm64 iOS Simulator build passes without signing
• git diff --check passes
• plutil lint of the Xcode project passes
• dashwallet build is blocked by the local missing Watch simulator runtime; the untouched swift-sdk-integration baseline fails with the identical error: No simulator runtime version from [23S303] available to use with watchsimulator SDK version 23T570
• focused runtime execution is blocked by the unavailable CoreSimulatorService

Manual smoke

• Coinbase to wallet transaction receives Coinbase and received icons
• wallet to Coinbase transaction retains Coinbase and sent icons
• metadata survives relaunch
• ordinary transactions remain untagged
• switching the active wallet does not mix pending matches or cached metadata

Apple Watch, Podfile, storage/keychain, platform SDK, TransferAmountViewModel, invitation/profile flows, and DASHSYNC_KEY_MIGRATION.md are unchanged.

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