Fix os and tty modules being emptied with Expo API Routes

[Nezz]

Issue: withStorybook replaces os and tty with empty modules on all platforms, breaking Expo API Routes

What I did

withStorybook unconditionally resolved os and tty to { type: "empty" } as a workaround. This breaks Expo API Routes (which bundle for the web platform) when any server-side dependency needs real Node built-ins like os.hostname().

Changes:

• Enabled path: Scoped the os/tty empty-module override to native platforms only (platform !== 'web'), so web/server bundles get the real Node modules.
• Disabled path: Removed the os/tty override entirely. When Storybook is disabled, all storybook/@storybook imports are already emptied, so the instrumentor is never loaded and its os/tty imports are never reached.
• Added tests covering both behaviors.

How to test

1. Set up an Expo project with API Routes and @storybook/react-native
2. In an API route, use any library that calls require("os") (e.g. os.hostname())
3. Verify the API route works without os.hostname is not a function errors
4. Verify Storybook still loads correctly on iOS/Android (the os/tty override still applies on native platforms)

• Does this need a new example in examples/expo-example? No
• Does this need an update to the documentation? No

If your answer is yes to any of these, please make sure to include it in your PR.

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[Nezz]

The intention behind doing this when storybook is disabled wasn't clear to me, but this could be re-added if needed with the web check

[dannyhw]

Its because I had some reports of these packages getting pulled in somehow even when storybook was disabled

[Nezz]

Oh wow, not sure how that could happen 😅

[dannyhw]

Yeah i don't know, just metro things 😅

[dannyhw]

Makes sense, thanks for the pr 🙏