Bump version to 0.8.0

[gantoine]

No description provided.

[greptile-apps]

Greptile Summary

Updates the plugin release metadata to version 0.8.0.

• Reports version 0.8.0 during QR device registration.
• Updates the Playnite extension version to 0.8.0.
• Adds the 0.8.0 installer entry with matching API requirement, package URL, release date, and changelog.

Confidence Score: 5/5

The PR appears safe to merge because all changed version and release metadata is internally consistent.

The extension version, QR registration client version, installer package version, Playnite API requirement, tag path, and artifact filename align with the repository's current release conventions.

_{Reviews (1): Last reviewed commit: "Bump version to 0.8.0" | Re-trigger Greptile}