feat(sdk-coin-sol): add v1 confidential transfer build, ops, example

[bhavidhingra]

Summary

Adds Solana v1 (SIMD-0296/0385) confidential transfer support to @bitgo/sdk-coin-sol: build v1 CT transactions, cover all CT operations, and broadcast them on-chain. (Consolidated from PRs #9810 and #9811.)

Changes

• confidentialTransferBuilder.ts: assemble v1 confidential transfer transactions — compileTransactionMessage({version:1,...}) (plain-TS serializer) + serializeWireTransaction to produce the v1 wire envelope (0x81 prefix, transactionConfig, base64 form).
• transaction.ts / transactionBuilder.ts: v1 serialization/version wiring so CT transactions build as v1.
• transactionBuilder/confidentialTransferV1Ops.ts: tests covering the remaining CT operations in v1 (Transfer, Deposit, ApplyPendingBalance, Withdraw, proof verification) plus ApplyPendingBalance ordering.
• examples/ts/sol/sdk-ct-v1-broadcast.ts: example that builds and broadcasts an SDK-built v1 confidential transfer.
• transactionBuilder/confidentialTransferV1.ts: v1 CT transaction build tests.

Notes

• v1 transactions use the SIMD-0296/0385 wire format (4096-byte limit); broadcast-time structural + signature validation is provided by the v1 validation primitives (see feat(sdk-coin-sol): validate v1 transaction signatures on broadcast #9852, merged).
• No @solana/kit dependency.

Refs: CHALO-1602

[linear-code]

CHALO-1602

[github-actions]

⚠️ Unit tests are failing on Node 26.x (Current release line, non-blocking). This is not an LTS version yet, so it does not block merge, but it signals an incompatibility to fix before Node 26.x becomes LTS.

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