chore: add prepublishOnly hook so dist/ is always built before publish

[Shawnchee]

Problem

The published package is entirely dist/ — main, module, and typings all resolve there and files is ["dist"]. But dist/ is gitignored and only produced by a manual npm run build (a step in PUBLISH.md). Nothing enforces that build, so a publish from a clean checkout / one where the build step is skipped / ships a package with no code

Change

"build": "npm run openapi-gen && npm run bundle",
"bundle": "tsup src/index.ts --dts --format esm,cjs",
"prepublishOnly": "npm run bundle",

prepublishOnly runs automatically before npm publish/pnpm publish, so dist/ is always built and packed

Design notes

• prepublishOnly, not prepare — prepare also runs on every npm install, pushing the build toolchain onto consumers/contributors; prepublishOnly runs only at publish time
• The hook runs bundle (tsup), not the full build — generated/ is committed, so dist/ builds without invoking openapi-gen (which needs Java) and without regenerating tracked sources at publish time. bundle is factored out of build so the tsup command isn't duplicated
• No change for consumers or npm install; build behaves exactly as before

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