feat(router-generator): implement AST-based export detection for routes

[w00khyung]

fix #4487

Enhanced the router generator with AST-based parsing logic to detect route exports.
Added support for both default and named exports in route files.

[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2025-07-22 12:32:45 UTC

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commit: 13a520d

[schiller-manuel]

thanks for approaching this. we already have very similar code for detecting the normal route exports. we should generalize this so it can be reused for both normal routes and the root route.

[w00khyung]

separated the common logic into utility files and modified the normal routes and root route to enable sharing of that logic.