chore(swift-sdk): clean up core transactions, wallet, balance, acccounts, etc in swift sdk

[ZocoLini]

Balances where not being shown correctly and the main issue was the enormous amount of logic, the underlying Rust lib contains the logic and the sdk only needs to wrap it, dropped all logic that was unnecessary and added one method to CoreWalletManager wrapper:

    public func getBalance(for wallet: HDWallet, accountIndex: UInt32 = 0) -> Balance {
        let managedAccount = try! sdkWalletManager.getManagedAccount(
            walletId: wallet.walletId,
            accountIndex: accountIndex,
            accountType: .standardBIP44
        )
        
        return try! managedAccount.getBalance()
    }

This follows the same pattern the transactions follow, asking directly the ffi for the balance.

Note that this PR is a cleanup, I drop unused stuff and logic layers that are not useful, the PR fixes the mentioned issue, and a couple more found while cleaning, like wallets being persisted twice, SPVclient reference being hold somewhere preventing it from de-initializing, wallet crashes after delete and maybe more

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

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[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/21918553199
• Artifacts: DashSDKFFI.xcframework (folder), DashSDKFFI.xcframework.zip, xc_checksum.txt

SwiftPM (host the zip at a stable URL, then use):

.binaryTarget(
  name: "DashSDKFFI",
  url: "https://your.cdn.example/DashSDKFFI.xcframework.zip",
  checksum: "e8fdb3cd8dce4b9d023b88df47525db1dc7c8434913c870abef7f080f5801d7d"
)

Xcode manual integration:

• Download 'DashSDKFFI.xcframework' artifact from the run link above.
• Drag it into your app target (Frameworks, Libraries & Embedded Content) and set Embed & Sign.
• If using the Swift wrapper package, point its binaryTarget to the xcframework location or add the package and place the xcframework at the expected path.