feat: support force close with double Control+C

[pi0]

Graceful shutdown takes ~3sec while sometimes it is unnecessary to wait, this improves UX by allowing second Control+C (or shutdown signal) to immediately force close server:

^C
Shutting down server in 3s... (press Ctrl+C again to force close)^C <-- second time
Force closing...
``

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

## Summary by CodeRabbit

* **Bug Fixes**
  * Improved server graceful shutdown behavior with enhanced force-close operation handling.
  * Added ability to force-close the server during shutdown using Ctrl+C keyboard shortcut.
  * Enhanced shutdown messages to provide clearer instructions about forcing server closure when necessary.

<sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Enhanced graceful shutdown mechanism in src/_plugins.ts by introducing a force-close callback variable. Implemented re-entrant shutdown handling and force-close timeout logic. Improved user messaging to include Ctrl+C force-close instruction. Changes enable immediate shutdown on subsequent invocations.

Changes

Cohort / File(s)

Summary

Graceful Shutdown Force-Close Logic src/_plugins.ts

Added forceClose callback variable to manage immediate force-close path. Implemented re-entrant shutdown handling that invokes forceClose on subsequent shutdown calls. Enhanced shutdown start message with Ctrl+C instruction. Added force-close implementation that clears timeout, logs progress, calls server.close(true), and resolves promise. Configured force-close to trigger after graceful shutdown timeout expires.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A hop through the shutdown, so graceful and grand,
With force-close awaiting, we've got it all planned,
Press Ctrl+C swift, if you cannot wait long,
The rabbits say "close!" and the server goes strong!
No more hanging 'round—just clean exits, my friend,
A powerful finale... The End. 🎬

✨ Finishing touches

• 📝 Generate docstrings

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commit: 0894e25