fix: improve startup signals behavior

[Nerivec]

• optimize imports in index.js
• add JS typing in index.js
• pass possible SIG to Controller stop
• add a few guards to prevent undesired errors in "aborted startup" scenario
• optimize passlist/blocklist behavior on startup, no unnecessary looping, move some ops outside of loop
• add "stopping" log in Controller to align behavior (starting, started, stopping, stopped)
  • e.g.: Stopping Zigbee2MQTT (restart=false, code=0, signal=SIGINT)
• use AbortController in Controller to abort startup sequence if necessary (mainly to prevent start+stop running concurrently on SIG which creates uncontrolled behaviors)
  • pass abort signal to Zigbee start and various nested calls that are possibly "long-running"
  • use return instead of throw to avoid clashing with rest of logic (would have to check error otherwise...)
  • no-op once startup finished

@Koenkk if you see a better way to do this... 😛

CC: @burmistrzak @sjorge @andrei-lazarov if you have some time to review this 😉

TODO:

• pass abort signal to ZH (need impl. in ZH)

[Copilot]

Pull request overview

This PR improves Zigbee2MQTT startup/shutdown behavior when receiving signals by making startup abortable, hardening stop paths during partially completed startup, and optimizing passlist/blocklist handling.

Changes:

• Add AbortController-based startup aborting and pass signal context into Controller.stop().
• Harden shutdown paths to avoid errors when stop occurs mid-startup (Zigbee/MQTT/state/onEvent).
• Optimize passlist/blocklist processing on Zigbee startup and extend tests for aborted-startup scenarios.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
index.js	Refactors startup script imports and adds JSDoc typing; passes signal into controller stop.
lib/controller.ts	Introduces abortable startup sequence and logs “Stopping …” with signal/code/restart context.
lib/zigbee.ts	Adds abort checks during Zigbee startup and optimizes passlist/blocklist removal behavior.
lib/mqtt.ts	Adds guard to avoid publishing offline state when MQTT client isn’t initialized.
lib/state.ts	Guards state cleanup logic during stop when Zigbee wasn’t fully started.
lib/extension/onEvent.ts	Guards stop-time onEvent calls when Zigbee wasn’t fully started.
test/controller.test.ts	Adds coverage for aborts during different startup phases; extends blocklist test.
test/mocks/mqtt.ts	Adds missing vi import for mock function usage.