chore: Bump version to 0.2.0

[nfebe]

Added

• API key edit endpoint with per-deployment access levels (read, write, admin) capped by the owning user's level
• Deployment protected mode: configurable blocked actions and command rules, with an explicit enable switch
• System terminal endpoint, behind its own protected-mode configuration and a new permission
• System file manager endpoint with listing, file and directory creation, chmod, and rename
• Cheap files-info variant (?usage=false) so the UI can render the system file manager without waiting for a recursive disk-usage walk

Fixed

• API key creation by an admin key with no associated user no longer returns 401; the owning admin is resolved automatically
• apiKeyToResponse emits null instead of the zero time for unset expires_at and last_used_at

[sourceant]

Code Review Summary

This pull request prepares the project for the 0.2.0 release by updating the version file and documenting significant new features and bug fixes in the changelog.

🚀 Key Improvements

• Updated VERSION to 0.2.0.
• Comprehensive CHANGELOG.md update covering new API features, protected mode, and file manager improvements.

[sourceant]

Review complete. No specific code suggestions were generated. See the overview comment for a summary.