Add support for migration and upgraded trading api

[jgeary]

Summary

• add a new migration module for the public /account/migration/* endpoints
• regenerate SDK types and endpoints from the patched public OpenAPI
• add support for the migrated signed-order flow used by the current API
• remove legacy order-signing behavior from the SDK instead of preserving it behind defaults
• update account and signing behavior so the SDK matches the post-migration API/protocol model

Changes

• add ctx.migration.getStatus(), start(), dismissOrders(), migrateFunds(), and restoreOrders()
• add signSponsoredMigrateFunds(), signRestoreOrder(), buildRestoreOrdersBody(), and restorePendingOrders()
• make chain config and address/domain resolution version-aware where migration signing still needs that context
• add support for the current signed-order model, including IOC market-style order payloads
• make migrated signing the default on both chain presets
• remove legacy limit-order signing support
• remove legacy market-order intent signing support
• remove legacy cancel signing support
• make explicit legacy order/cancel signing requests fail instead of silently working
• keep the holdings-side migration signature flow needed for one-time fund migration
• keep createMarket() as a high-level market-order API while mapping buy-side requests to the current signed-order model
• treat buy-side createMarket() sizing as a pre-fee collateral budget and document that maxFee is added by the signing layer
• update restore signing to use remainingSize semantics from migration drafts
• update account flows to use the correct versioned holdings/settlement addresses
• make gasless deposit explicitly unavailable, matching the current public API contract
• remove stale market quote/oracle-quote helpers that are not part of the current public API
• update examples to stop using removed quote helpers
• update generator key overrides so migration endpoints come from generated OpenAPI output instead of local hand-augmentation
• replace the local endpoint shim with direct generated endpoint exports
• add tests for migration routes and signing helpers
• add tests for migrated default signing behavior
• add tests proving legacy order/cancel signing is rejected
• update API validation and module tests to match the current public API surface