Add domestic futures/options API coverage

[Bogyie]

Summary

• Add domain-scoped domestic futures/options inventory API entry points covering 44 operation ids across trading/account, quotation, and realtime quotation collections.
• Expose operation id constants and scoped validation so non-domain operation ids fail before network I/O.
• Extend SDK core tests and docs/report coverage notes for the new domestic futures/options surface and existing safety gates.

Verification

• cargo test --locked domestic_futures_options -- --nocapture passed in QA.
• cargo test --locked passed in QA, including mock contract tests, SDK core tests, and doctests.
• cargo fmt --check passed in QA.
• cargo clippy --all-targets -- -D warnings passed in QA.
• git diff --check passed locally before commit and in QA.
• QA independently parsed inventory collections and confirmed all 44 operation ids match src/apis/domestic_futures_options.rs constants.

Safety and Scope

• Live KIS API calls, real credentials, and actual order execution were not exercised.
• Order-changing endpoints retain explicit TR ID selection requirements and local LiveTradingDisabled protection for real trading mutations.
• Repository contribution files checked: README.md, Cargo.toml, docs/mock-server/README.md, .github/workflows/publish-crates.yml; no PR template, CONTRIBUTING, CODEOWNERS, SECURITY, or license file was present.

[amazon-q-developer]

Review Complete

This PR successfully adds domestic futures/options API coverage with 44 operation IDs across trading/account, quotation, and realtime quotation collections. The implementation is solid with comprehensive safety mechanisms and test coverage.

Key strengths:

• Domain-scoped validation prevents incorrect operation IDs from reaching network I/O
• Trading mutations retain LiveTradingDisabled protection in real environments
• Ambiguous TR IDs require explicit override, preventing misconfiguration
• Comprehensive test suite covers validation, safety guards, and mock execution
• Documentation accurately reflects new capabilities

Verification:
All tests pass according to the PR description, including:

• cargo test --locked domestic_futures_options
• cargo test --locked (full suite)
• cargo fmt --check and cargo clippy

The code follows established patterns from the existing domestic stock implementation and maintains consistency with the SDK's safety-first design. No blocking issues identified.

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