chore: adding scaffolding for OF node server provider

[joker23]

Note

Low Risk
Low risk: primarily adds a new workspace package scaffold and release/build wiring, with no functional provider implementation yet (only a new re-export in the shared OpenFeature common package).

Overview
Introduces a new workspace package, @launchdarkly/openfeature-node-server, including initial build/test/tooling config (tsup, tsconfig, jest) and documentation, but with an empty src/index.ts placeholder for a follow-up provider implementation.

Wires the new package into the monorepo and release automation by updating root package.json workspaces, root tsconfig project references, release-please config/manifest, and adds .claude/stacks to .gitignore. Also re-exports translateContext from @launchdarkly/openfeature-js-server-common to make it part of that package’s public API.

^{Reviewed by Cursor Bugbot for commit a1477d5. Bugbot is set up for automated code reviews on this repo. Configure here.}

[joker23]

@cursor review

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25623 bytes
Compressed size limit: 29000
Uncompressed size: 125843 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 31866 bytes
Compressed size limit: 34000
Uncompressed size: 113634 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 179311 bytes
Compressed size limit: 200000
Uncompressed size: 830815 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 38473 bytes
Compressed size limit: 39000
Uncompressed size: 211104 bytes

[joker23]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit a1477d5. Configure here.}

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.