[FSSDK-12453] server bundle addition

[junaed-optimizely]

Summary

Server bundle addition for RSC support

Test plan

Manually tested in server ENV

Issues

• FSSDK-12453

[Copilot]

Pull request overview

Adds a dedicated server-safe entrypoint and build output so @optimizely/react-sdk can be imported from React Server Components (RSC) without pulling in client-only React APIs.

Changes:

• Introduces src/server.ts as a server-safe entrypoint re-exporting client creation, logging, helpers, and types.
• Updates Rollup config to emit an additional server-focused ESM bundle (dist/server.es.min.mjs).
• Adds a react-server conditional export in package.json to route RSC environments to the server bundle + types.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/server.ts	New server-safe public entrypoint exposing non-React-API surface for RSC usage.
rollup.config.mjs	Builds an additional minified ESM output for the new server entry.
package.json	Adds react-server conditional export pointing to the new server bundle and types.

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