feat(rsbuild): add RSC federation host/remote example

[ScriptedAlchemy]

Summary

• Add the base rsbuild RSC federation example packages and workspace wiring
• Add the shared example package, baseline host example setup, manifest verification, and Playwright coverage needed for the stack
• Keep the later module-pattern expansion and runtime-registration behavior in follow-up PRs

Stack

Current stack, bottom to top:

• #12977 feat(mf): layer-aware sharing and runtime scope-array support
• #13203 feat(mf): emit RSC metadata in federation manifests
• #13204 feat(rsbuild): add RSC federation host/remote example <- this PR
• #13208 feat(rsbuild): add RSC federation module patterns
• #13215 feat(rsc): register federation manifest data at runtime

Why This PR Exists

This PR establishes the example workspace and baseline verification surface for the stack. It intentionally stops short of the broader module-pattern surface and the runtime-registration plugin.

References

• rsbuild-plugin-rsc

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

[github-actions]

Rsdoctor Bundle Diff Analysis

⚠️ Note: The latest commit (354076ee82) does not have baseline artifacts. Using commit 475e5a937e for baseline comparison instead. If this seems incorrect, please wait a few minutes and try rerunning the workflow.

Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	0
react-1k	826.2 KB	0
ui-components	2.3 MB	0
react-5k	2.7 MB	0
rome	984.2 KB	0

Generated by Rsdoctor GitHub Action

[github-actions]

📦 Binary Size-limit

Comparing 06b2de2 to feat!: remove .wasm from default js extensions (#13321) by hardfist

❌ Size increased by 83.63KB from 49.01MB to 49.09MB (⬆️0.17%)

[codspeed-hq]

Merging this PR will not alter performance

✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing cursor/rsbuild-rsc-federation-example-5928 (06b2de2) with cursor/manifest-rsc-client-data-d493 (ee282a6)}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[SyMind]

@ScriptedAlchemy We should move Rsbuild RSC example in https://github.com/rstackjs/rsbuild-plugin-rsc/tree/main/examples

[ScriptedAlchemy]

@ScriptedAlchemy We should move Rsbuild RSC example in https://github.com/rstackjs/rsbuild-plugin-rsc/tree/main/examples

yeah i know, im trying to build up a pr chain where incrementally layer on requirements, rsc data i need, then some basline rsc application to e2e it against to ensure manifest data is emitted and the refs are all correct, in the manifests, then connect the apps togehter and write a runtime dynamic registration layer for consumers so remote cna register client refs into host at runtime

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