Add builder vaultless state APIs

[findolor]

Summary

• Add explicit builder APIs setVaultless and getVaultless for JS/WASM consumers.
• Keep setVaultId mutually exclusive with vaultless and reject zero through settings validation.
• Round-trip vaultless flags through generated dotrain and serialized builder state, including a legacy state fallback.

Validation

• cargo test -p raindex_common test_set_and_get_vaultless
• cargo test -p raindex_common raindex_order_builder::state_management::tests
• cargo check -p raindex_js_api
• npm run build && npm test -- test/js_api/builder.test.ts in packages/raindex
• Final stack: rainix-rs-static
• Final stack: wasm target cargo test for raindex_quote, raindex_bindings, raindex_js_api, raindex_common
• Final stack: npm run build && npm test in packages/raindex

Review

• Staged local review completed. During self-review, serialized-state backward compatibility was fixed before final review; both reviewers were clean.

Refs RAI-1063.

[linear]

RAI-1063

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• Create PR with unit tests
• Commit unit tests in branch rai-1063-js-builder-vaultless-state

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Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Surface vaultless read models #2774
• Handle vaultless deployment operations #2773
• Add builder vaultless state APIs #2772 👈 (View in Graphite)
• Reject zero vault operations #2771
• Emit vaultless add-order IO #2770
• Add vaultless order IO settings #2769
• main

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