fix(rolldown): exclude dynamic imports from initial chunks

[hyoban]

Description

Initial JS currently includes chunks reached only through dynamic imports. For example, an entry that statically imports a framework and dynamically imports a chart counts the chart as initial too.

Follow only static imports from user-defined entries, and recompute is_initial when restoring cached snapshots so existing traces receive the correction without rebuilding.

Linked Issues

None.

Additional context

Adds five regression tests covering dynamic-only subtrees, cycles, multiple entries, chunks shared by static and dynamic paths, and older snapshots. The traversal and snapshot tests fail without the fix.

Validation: pnpm lint, pnpm build, and pnpm test --run passed (347 passed, 2 skipped). pnpm typecheck reports the same eight existing Nuxt/Vite plugin type errors on both unmodified 59260bfd and this branch, in the Oxc, Rolldown, and Vite src/modules/rpc.ts files.

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commit: 380e533