Add Relay support tooling and off-curve workaround validation

[tracy-codes]

Summary

• add reusable Relay-to-Swig adapter utilities for fetching quotes, resolving route instructions, rewriting account metas, and preparing getSignInstructions batches
• add reproducible Surfpool scripts to validate Relay routes end-to-end, including a one-command runner that starts Surfpool, executes transactions, and prints custom-RPC Explorer links

Problem

Relay token routes currently fail quote construction when the Solana user is an off-curve address (for example a PDA wallet), returning NO_SWAP_ROUTES_FOUND. That prevents directly requesting token-route instructions for Swig wallet PDAs.

Current workaround in this PR

• request quote data for an on-curve user
• rewrite owner-coupled account metas (user + relevant source ATAs) to the Swig wallet context
• execute via Swig CPI signing (getSignInstructions)

This preserves execution for supported routes while Relay off-curve user support is pending.

Validation

• validated on Surfpool mainnet fork with USDC token flow and cheatcode-funded token accounts
• baseline quote-user transaction and rewritten Swig-wrapped transaction both execute successfully and spend the expected token amount
• added generic and focused repro scripts so this can be rerun/debugged quickly

Follow-up

Once Relay supports off-curve Solana users for token-route quoting, this rewrite workaround can be removed in favor of direct quote generation for the Swig wallet address.