feat!: release @launchdarkly/openfeature-js-server-common

[joker23]

This PR will release the openfeature-js-server-common package to npm at version 1. This package is not meant to be used directly, but rather as a shared package that is used by sdks. All this to say, publishing this package is effectively a NOOP.

We just want to make sure this package publishes before we publish openfeature-node-server

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Note

Low Risk
Changes are mostly CI, release automation, and documentation; no application runtime logic changes in the diff.

Overview
Prepares @launchdarkly/openfeature-js-server-common for its first stable npm release at 1.0.0 (replacing prerelease settings in release-please-config.json).

Adds a dedicated CI workflow (openfeature-server-common.yaml) and wires the package into release-please: manual publish option, release output flag, and a release-openfeature-server-common job (after release-common). release-openfeature-node-server now depends on that job so the shared package can publish first.

Documentation updates list the package in the root README and CONTRIBUTING dependency diagram. The package README drops the pre-release caution and points CI/docs badges at the new workflow. typedoc.json is added for API docs generation.

In package.json, lint moves to ESLint 9 (typescript-eslint, import-x, etc.) with a simplified lint script; runtime library code is unchanged in this diff.

^{Reviewed by Cursor Bugbot for commit 16ecb71. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 26365 bytes
Compressed size limit: 29000
Uncompressed size: 129044 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 38739 bytes
Compressed size limit: 39000
Uncompressed size: 212244 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 179579 bytes
Compressed size limit: 200000
Uncompressed size: 831422 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 31978 bytes
Compressed size limit: 34000
Uncompressed size: 114243 bytes