Deluan f7df54874c feat: implement per-library artist statistics with automatic aggregation
Implemented comprehensive multi-library support for artist statistics that
automatically aggregates stats from user-accessible libraries. This fundamental
change moves artist statistics from global scope to per-library granularity
while maintaining backward compatibility and transparent operation.

Key changes include:
- Migrated artist statistics from global artist.stats to per-library library_artist.stats
- Added automatic library filtering and aggregation in existing Get/GetAll methods
- Updated role-based filtering to work with per-library statistics storage
- Enhanced statistics calculation to process and store stats per library
- Implemented user permission-aware aggregation that respects library access control
- Added comprehensive test coverage for library filtering and restricted user access
- Created helper functions to ensure proper library associations in tests

This enables users to see statistics that accurately reflect only the content
from libraries they have access to, providing proper multi-tenant behavior
while maintaining the existing API surface and UI functionality.

Signed-off-by: Deluan <deluan@navidrome.org>
2025-07-15 14:14:06 -04:00
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