VCS-11094: Update SDK to 0.9.9 and release version 0.5.7

[s-bernhardt]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the VCS realtime SDK to version 0.9.9 and bumps the demo application version to 0.5.7. The changes include updating dependencies and correcting author information across the project.

• Update SDK dependency from 0.9.3 to 0.9.9
• Bump demo application version from 0.5.6 to 0.5.7
• Update author information to reflect current company ownership

Reviewed Changes

Copilot reviewed 4 out of 7 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updates main package version and author information
frontend/package.json	Updates frontend package version, author, and SDK dependency to 0.9.9
backend/package.json	Updates backend package version and author information
backend/index.js	Corrects environment variable reference from VCS_AUTH_TYPE to AUTH_TYPE

Files not reviewed (2)

• backend/package-lock.json: Language not supported
• frontend/package-lock.json: Language not supported

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[s-bernhardt]

here we could wait for vcs-realtime-sdk-0.9.10.tgz because vcs-realtime-sdk-0.9.9.tgz is showing vcs-realtime-sdk-0.9.9-SNAPSHOT due to a bad commit