chore: openfeature cloudflare provider scaffold

[joker23]

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• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

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Note

Overview
Introduces @launchdarkly/openfeature-cloudflare-server (v0.1.0 pre-release) so Cloudflare Workers can use OpenFeature with LaunchDarkly via the KV-backed Cloudflare server SDK.

The LaunchDarklyProvider is a thin subclass of BaseOpenFeatureProvider: it takes clientSideID, a KVNamespace, and optional LDOptions, calls init from @launchdarkly/cloudflare-server-sdk, and deliberately does not wire ConfigurationChanged (documented in README and code comments). Evaluation, context translation, and error mapping come from @launchdarkly/openfeature-js-server-common, same pattern as the Node OpenFeature provider.

The monorepo registers the new workspace and TypeScript project reference. The package ships build/lint/test tooling, README (isolate-scoped provider init, nodejs_compat, flush-per-request), license, and Jest coverage for init failures, all flag types, LD→OpenFeature error codes, tracking, and context logging.

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[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 26360 bytes
Compressed size limit: 29000
Uncompressed size: 129188 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 41502 bytes
Compressed size limit: 44000
Uncompressed size: 224541 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 32444 bytes
Compressed size limit: 34000
Uncompressed size: 116232 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 179887 bytes
Compressed size limit: 200000
Uncompressed size: 833430 bytes

[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 1 additional finding.