perf(backend): switch bundler from rollup to rolldown

[gmaclennan]

Replaces rollup 4 with rolldown 1.1.2 for the on-device backend bundle.

Drops @rollup/plugin-{node-resolve,alias,commonjs,json,esm-shim} and rollup-plugin-esbuild in favour of rolldown built-ins (platform: node, resolve.alias, native cjs/json, output.minify). The custom plugins (addon-loader, sentry debug-ids, copy-assets, relocate-sourcemaps) and @sentry/rollup-plugin are unchanged — they run on rolldown's rollup-compatible hooks. rollup.config.ts is renamed to rolldown.config.ts.

Full backend build (Android debug + release + iOS) drops from ~36s to ~5s, roughly 6.9x.

Output verified equivalent: identical native addon rewrites (same 7 modules + pinned versions), static assets copied, sourcemaps relocated out of the asset trees, sentry debug ids embedded with the relocate plugin's sanity check passing, all 34 backend tests pass, and the minified entry is slightly smaller than rollup's.

Notes:

• Plugin filenames are left as rollup-plugins/rollup-plugin-*.js (bundler-agnostic; renaming is cosmetic).
• Not exercised on-device (needs nodejs-mobile); equivalence is static/structural.

🤖 Generated with Claude Code

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	rolldown@​1.1.2

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm @emnapi/runtime is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: backend/package-lock.json → npm/@comapeo/core@7.1.0 → npm/rolldown@1.1.2 → npm/@emnapi/runtime@1.11.1 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/@emnapi/runtime@1.11.1. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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