feat(public-trackers): add bulk tracker management for public torrents

[s0up4200]

Summary

Add a new feature to manage trackers on public torrents:

• Fetch tracker lists from a configurable remote URL (e.g., trackerslist)
• Three prune modes via context menu:
  • Replace All Trackers - Remove all existing, add from list
  • Remove Dead, Add New - Remove only dead/erroring trackers, add from list
  • Add Missing Trackers - Keep existing, add from list
• Automatic filtering of private torrents (skipped with count shown)
• Settings page under Settings > Public Trackers for URL configuration
• Manual refresh button to update cached tracker list

Test plan

• Configure a tracker list URL in Settings > Public Trackers
• Click Refresh to fetch the list
• Select public torrents, right-click > Manage Public Trackers
• Test each prune mode
• Verify private torrents are skipped
• Verify error handling when URL is not configured

Closes #917

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/public-tracker-management

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