feat(admin): improve update automation and dependency handling
- Add complete script documentation and usage examples
- Create SpotDL virtual environment automatically
- Install pip if missing from the virtual environment
- Install and update spotdl, yt-dlp, and youtube-dl automatically
- Upgrade pip, setuptools, and wheel during maintenance
- Improve logging and status reporting
- Fix update task status message mappings
- Create log directory automatically when missing
- Add Docker image update and restart handling
- Improve shell quoting and error resilience
- Support optional email reporting mode
- Consolidate system maintenance into a single workflow
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Lucas Vivohost