feat: Add Across Perps withdraw support

[pedronfigueiredo]

Summary

Adds Across support for HyperLiquid-source Perps withdraw post-quote flows in transaction-pay-controller.

Changes

• Adds perpsAcrossWithdraw to TransactionType for Across Perps withdraw bridge legs.
• Detects direct and nested perpsWithdraw transactions.
• Allows supported HyperLiquid-source Perps withdraw post-quote requests through the Across strategy.
• Normalizes HyperLiquid-source Across requests to HyperCore USDC-PERPS and shifts USDC amounts from 6 to 8 decimals.
• Uses Arbitrum USDC as the fiat-rate anchor for HyperCore USDC-PERPS source quotes.
• Skips prepending the original EVM transaction for HyperLiquid-source post-quote Across withdraw submissions.

---

Note

Medium Risk
Adds new transaction typing and conditional quote/submit logic for HyperLiquid-source Perps withdrawals, affecting how Across requests are normalized, validated, and submitted. Risk is moderate due to changes in transaction classification and gas/fiat calculations, but the behavior is gated to a specific request shape.

Overview
Adds Across support for post-quote HyperLiquid-source Perps withdrawal flows.

Introduces a new TransactionType.perpsAcrossWithdraw bridge-leg type and a new isPerpsWithdrawTransaction helper (including nested-transaction detection) so the Across submit path can label generated transactions correctly.

Updates the Across strategy/quotes/submit pipeline to accept supported HyperLiquid-source withdraw requests even when source/target are same-chain, normalize them to HyperCore USDC-PERPS with 6→8 decimal shifting, anchor fiat-rate lookup to Arbitrum USDC, and avoid prepending the original parent tx / post-quote gas when submitting these withdraws (covered by new tests and changelog entries).

^{Reviewed by Cursor Bugbot for commit ddcc878. Bugbot is set up for automated code reviews on this repo. Configure here.}