feat: Improve external dependency handling for non-standard project structures (adapter-node)

[Black1358]

This PR enhances the Rollup configuration to better handle projects where package.json isn't located in the same directory (my case).

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[benmccann]

New features should include an explanation of why they are necessary (why does your package.json need to be located elsewhere) and documentation for the new feature. It's hard to review without this context

[Black1358]

In my specific case, I'm not just working with an one SvelteKit application, and I can't use a monorepo approach (it would add unnecessary complexity). Everything works perfectly until it gets to the build stage. The adapter fails with an error because it can't find the package.json which is located one level up. The adapter definitely shouldn't prevent us from having structure like

/app/...  
/package.json

[elliott-with-the-longest-name-on-github]

Please open an issue with a reproduction of your problem.

[Black1358]

Please open an issue with a reproduction of your problem.

The problem is that the adapter's code hardcodes the path to package.json when parsing dependencies. When the project has this structure:

app/...  
package.json  

the build fails with an error since it can't locate the package.json file

[benmccann]

There's still not really enough information here to understand your problem. This should really include an issue with a reproduction