Add Turnkey swap APIs and example for executing swaps

[Bijan-Massoumi]

Summary & Motivation

Turnkey now exposes first-party swap APIs (quote, execute, status, config). This PR syncs that surface into the SDK packages and adds a runnable example that quotes a swap, submits executeSwap, then polls getSwapStatus until completion.

Swagger/types were updated from mono for the swap endpoints (including required walletAccount on getSwapQuote). High-level clients in @turnkey/http, @turnkey/sdk-server, @turnkey/sdk-browser, @turnkey/sdk-types, and @turnkey/core were regenerated so callers can use the new methods without hand-rolling requests.

The example (examples/defi/execute-swap) is configured via env for CAIP-19 FROM_TOKEN / TO_TOKEN, base-unit AMOUNT, and wallet/SIGN_WITH, so the same flow can cover Solana SOL↔USDC (and other supported pairs) without code changes.

How I Tested These Changes

• Regenerated package clients via pnpm --filter @turnkey/{sdk-server,sdk-browser,sdk-types,core} codegen
• Typechecked: @turnkey/http, @turnkey/sdk-types, @turnkey/sdk-server, @turnkey/sdk-browser, @turnkey/core, and @turnkey/example-execute-swap
• Ran examples/defi/execute-swap against preprod:
  • Solana mainnet SOL → USDC via getSwapQuote → executeSwap → getSwapStatus
  • Confirmed status progressed PENDING → COMPLETED with an origin tx on Solscan
  • Required feature flags on the test org: FEATURE_FLAG_SWAP, FEATURE_FLAG_SOL_SEND_TRANSACTION

Did you add a changeset?

Yes. .changeset/execute-swap-apis.md (minor) for:

• @turnkey/http
• @turnkey/sdk-server
• @turnkey/sdk-browser
• @turnkey/sdk-types
• @turnkey/core

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[DeRauk]

@Bijan-Massoumi Could you add a readme, like we have with the other examples? And could you make sure we put in the readme that this is in closed beta right now?