chore: Add tag-prefix for vue-client-sdk release collection

[aaron-zeisler]

The vue-client-sdk repo uses prefixed release tags (e.g. launchdarkly-vue-client-sdk-v2.3.0) but the metadata didn't specify a tag-prefix, so sdk-meta couldn't collect releases after 2.2.0.

Here's the related pull request in the sdk-meta repository: launchdarkly/sdk-meta#366

Requirements

• 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

Low Risk
Single metadata change that only affects how release tags are discovered; no runtime code or security-sensitive logic is modified.

Overview
Adds a releases.tag-prefix entry for the Vue SDK in .sdk_metadata.json, allowing release collection to match prefixed tags like launchdarkly-vue-client-sdk-vX.Y.Z.

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