fix(create): nest nitro rollup config

[jong-kyung]

Summary

Generated React Nitro/Railway projects now pass Sentry rollup externals through Nitro's config option. This avoids the type error caused by passing rollupConfig at the top level of the Nitro Vite plugin options.

Validation

• pnpm --filter @tanstack/create build
• pnpm --filter @tanstack/create test

Summary by CodeRabbit

• Chores
  • Updated build configuration structure for Nitro and Railway hosting integrations to align with current plugin requirements.
  • Preserved external handling for Sentry packages during builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: db77c06c-944b-4ebb-8e65-0d774c1111a2

📥 Commits

Reviewing files that changed from the base of the PR and between db108a1 and c140541.

📒 Files selected for processing (2)

• packages/create/src/frameworks/react/hosts/nitro/info.json
• packages/create/src/frameworks/react/hosts/railway/info.json

🚧 Files skipped from review as they are similar to previous changes (2)

• packages/create/src/frameworks/react/hosts/nitro/info.json
• packages/create/src/frameworks/react/hosts/railway/info.json

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📝 Walkthrough

Walkthrough

Two hosting integration snippets now nest rollupConfig inside a config object within nitro(). Both snippets preserve the @sentry/ externalization rule.

Changes

Nitro Configuration Examples

Layer / File(s)	Summary
Nitro config structure update packages/create/src/frameworks/react/hosts/nitro/info.json, packages/create/src/frameworks/react/hosts/railway/info.json	Both configuration snippets now place rollupConfig inside config while preserving the @sentry/ external pattern.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: nesting the Nitro rollup configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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