RobinTail / express-zod-api / 28324522267

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fix(mem): Ensure single graceful shutdown monitoring (#3495)

Extracted from #3490 
Minor memory optimization for an edge case of running multiple servers
on the same process.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Updated graceful shutdown to use an options-based setup and a runtime
`add(...)` helper for registering servers.
  * Exposes `isShuttingDown` to indicate shutdown progress.
* **Bug Fixes**
* Ensures only one termination listener is installed per signal to avoid
duplicates.
* Prevents concurrent shutdown re-entry and improves reliable
socket/server closing, including safe handling of synchronous
`beforeExit` errors.
* **Tests**
* Adjusted graceful shutdown and termination listener tests for the new
API flow and added shutdown-state assertions.
* **Documentation**
* Added `v28.7.3` changelog notes covering listener installation and
hook error handling behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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