feat: Wire packages/sdk/vue into release-please as an active prerelease

[joker23]

This PR will enable publishing the prereleased version of vue client sdk v3 to npm.

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Note

Overview
Enables automated prerelease publishing of @launchdarkly/vue-client-sdk instead of leaving the release job disabled.

The release-vue workflow job now runs when release-please creates a Vue release and passes prerelease: true to full-release so npm’s latest tag is not moved until GA. release-please for packages/sdk/vue is configured with prerelease, prerelease-type: beta, and version bumps in LDVueClient.ts.

Package metadata is aligned for a public npm package: Vue is listed in the root README and CONTRIBUTING dependency diagram; the Vue README shows npm/docs badges and describes pre-release expectations instead of “experimental / not published.” The published dependency on @launchdarkly/js-client-sdk is pinned to 4.9.4 (replacing workspace:^), and the default wrapperVersion is bumped to 0.1.4.

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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/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

[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

[joker23]

I am going to try this out and publish on a npm tag that is not latest.