fix: export Suibets alias in TypeScript SDK

[realfishsam]

Summary

• Add a TypeScript Suibets export alias for SuiBets
• Include the alias in the package root exports and default export object

Fixes #885

Test Plan

• git diff --check
• npm run build --workspace=pmxtjs (not rerun here; generated TypeScript client is absent in this checkout and the same command fails before this change on ../generated/src/index.js)

[realfishsam]

PR Review: PASS (NOT VERIFIED)

What This Does

Adds a TypeScript SDK Suibets casing alias beside SuiBets and exports it from the package entrypoint/default object.

Blast Radius

TypeScript SDK entrypoint and client class exports only.

Consumer Verification

Before (base branch):
Base TypeScript consumers could import/use SuiBets but not the Python-style Suibets casing alias.

After (PR branch):
PR adds export const Suibets = SuiBets and includes it in sdks/typescript/index.ts. Core build/Jest passed (24 suites, 644 tests); root verification then hit missing pytest.

Test Results

• Build: PASS
• Unit tests: CORE PASS (24 suites, 644 tests; root verification blocked by missing pytest)
• Server starts: PASS during root verification
• E2E smoke: NOT VERIFIED (TypeScript package import smoke not run)

Findings

No blocking findings.

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: N/A
• Financial precision: N/A
• Type safety: OK
• Auth safety: N/A

Semver Impact

patch -- backwards-compatible SDK export alias.

Risk

Published package export behavior was not validated with a built TypeScript SDK package.