fix(library): normalize artist name sorting across the API and UI

[cachamber]

Description

This PR fixes artist sorting behavior in the library:

artist names now sort without case sensitivity
names beginning with “The ” sort by the next word
server-side ordering now matches UI behavior and is applied before pagination

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Enhancement (improvement to existing functionality)
• Documentation update
• Code cleanup / refactoring
• Other (please describe):

Related Issues

Fixes #174

Changes Made

• Backend: updated artist list sorting in [artists.ts]
• Frontend: normalized artist sorting for library view in [page.tsx]

Testing Done

• Tested locally with Docker
• Tested specific functionality:
• • Lower case artist "alt-J" sorted into the As
• • "The Beatles" sorted into B

Screenshots (if applicable)

Before:

After:

Checklist

• My code follows the project's code style
• I have tested my changes locally
• I have updated documentation if needed
• My changes don't introduce new warnings
• This PR targets the main branch