refactor(common-ts): add oracle limit order support for swift

[ChesterSim]

Summary

Adds oracle limit order support for Swift perp orders. Previously, Swift only accepted limit order types — this extends it to also support oracleLimit, which uses an oracle price offset instead of a fixed limit price.

Changes

• New type OracleLimitOrderParamsOrderConfig in common-ts/src/drift/base/actions/trade/openPerpOrder/types.ts — defines the oracle limit order config with oraclePriceOffset field
• New union type SwiftLimitOrderParamsOrderConfig — LimitOrderParamsOrderConfig | OracleLimitOrderParamsOrderConfig, used wherever Swift limit orders are accepted
• Updated prepSwiftLimitOrderData in openPerpNonMarketOrder/index.ts — branches on orderConfig.orderType to handle limit vs oracleLimit with different order param construction (limit price vs oracle price offset)
• Updated validation in both CentralServerDrift/index.ts and openPerpNonMarketOrder/index.ts — error messages now accept 'limit' or 'oracleLimit'
• Refactored bracket orders — bracketOrders are now returned from prepSwiftLimitOrderData and passed through explicitly rather than accessed from orderConfig directly

Test plan

• Verify existing limit orders via Swift still work correctly
• Verify oracle limit orders can be placed via Swift with a valid oraclePriceOffset
• Verify non-limit/non-oracleLimit order types are rejected with the updated error message
• Type-check passes: bunx tsc --noEmit in common-ts

[ChesterSim]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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