fix(domains): cancel retries using a threading event

[roflcoopter]

This improves the shutdown and future reload handling by instantly cancel retries using a threading.Event

[netlify]

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🔨 Latest commit	85e4b66
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[Copilot]

Pull request overview

This pull request enhances the domain retry cancellation mechanism by introducing per-domain cancel_event (threading.Event) to enable instant cancellation of retry loops during shutdown or domain reload operations. The previous approach used a global reloading_event and polled shutdown/reload states in tight loops, which has been replaced with event-based cancellation that wakes up blocking waits immediately.

Changes:

• Added cancel_event field to DomainEntry for per-domain retry cancellation
• Replaced polling-based retry wait loops with event-based wait using cancel_event.wait(timeout)
• Removed global reloading_event in favor of per-domain cancellation events
• Refactored shutdown signal handling in __main__.py to use a daemon thread instead of nested Timer

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
viseron/domain_registry.py	Added cancel_event field to DomainEntry and implemented cancel_retry() and cancel_all_retries() methods
viseron/domains/init.py	Replaced polling-based retry wait with cancel_event.wait(), added cancel_retry call in unload_domain, improved state management to keep RETRYING visible during retry attempts
viseron/init.py	Removed global reloading_event, added cancel_all_retries() call in shutdown, changed thread filtering from "setup_domains" to "MainThread"
viseron/main.py	Refactored signal handler to start shutdown on daemon thread, improved shutdown flow with proper thread joining and timeout handling
viseron/config.py	Removed unused variable assignment that was immediately overridden

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