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feat: add remaining_quantity support to listings and fulfillment (#1784)

* feat: add remaining_quantity support to listings and fulfillment

Add remaining_quantity field to Listing type to track available items in partially filled orders. Update fulfillment logic to automatically use remaining_quantity when unitsToFill is not explicitly specified, preventing transaction failures when attempting to fulfill more items than are available.

Changes:
- Add remaining_quantity field to Listing type definition
- Update fulfillOrder to default to remaining_quantity when available
- Support both Listing (remaining_quantity) and OrderV2 (remainingQuantity) types
- Maintain backwards compatibility when field is not present
- Add comprehensive test coverage for new functionality
- Verify field existence via live API testing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: use valid Seaport protocol address in test fixtures

Update mockListing fixtures to use CROSS_CHAIN_SEAPORT_V1_6_ADDRESS instead of invalid "0xabc" address. This fixes protocol validation errors in remaining_quantity tests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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Co-authored-by: Claude <noreply@anthropic.com>

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