fix(subsonic): fix search3 empty query sync, correct lyrics route and…

[cachamber]

Description

Subsonic: add the following

• request tracing
• search3 empty-query sync support
• lyrics v2 support
• lyrics parity with web route

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 #182

Changes Made

• search3 implementation wasn't correct - short circuit to return if query was empty
• update Subsonic Extensions to return correct format
• lyrics route now follows web route
• add lyrics v2 support
• add subsonic request tracing
• add subsonic route tests for search and lyrics

Testing Done

• Tested locally with Docker
• Tested specific functionality:
  -- Tested and validated with Symfonium 14.1.0 on android
  -- Tested and validated with Amperfy 2.1.0 build 21 on iphone

Screenshots (if applicable)

Amperfy (iphone)

Symfonium (android)

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