feat: add support for all export shapes to package API docs

[serhalp]

🔗 Linked issue

Fixes #1479

🧭 Context

There are a couple problems with the current implementation of our "package docs" feature:

1. Some packages do not have generated package docs at all. This is because we were asking esm.sh for the package root (./), getting a 404 or no types back, and then rendering nothing, even when a package had other perfectly good typed exports.
2. Some packages really have multiple docs surfaces, not just one. For packages with several typed entrypoints, a single flat docs page is probably the wrong model. Users need to be able to move between entrypoints explicitly, know what they're looking at, share permalinks, etc..

📚 Description

On the backend, broaden entrypoint discovery so we can find all typed subpath exports from package.json#exports, including nested condition objects like import.types.

On the frontend, make the package docs entrypoint-aware:

• If a package is subpaths-only, the base docs URL redirects to the first listed entrypoint.
• If a package has both root docs and subpath docs, the base docs URL renders the root docs.
• In all cases, add an explicit entrypoint selector to the UI.
• The route now looks like /package-docs/:pkg/v/:version/:entrypoint.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Apr 27, 2026 0:55am

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ignored	Preview	Apr 27, 2026 0:55am
npmx-lunaria	Ignored		Apr 27, 2026 0:55am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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