Set proxy status to 'restarting' and dispatch ProxyStatusChangedUI event
at the very beginning of handle() method, before StopProxy runs. This
notifies the UI immediately so users know a restart is in progress,
rather than waiting until after the stop operation completes.
Also simplified unit tests to focus on testable job configuration
(middleware, tries, timeout) without complex SchemalessAttributes mocking.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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