Remove process.exit() Usage

[fine-ai]

Implement graceful server shutdown in server.js

- Replaced the existing shutdown function with a more robust implementation.
- The new shutdown function:
  1. Waits for the server to close existing connections before exiting.
  2. Implements a 10-second timeout to force shutdown if the server takes too long.
  3. Uses `process.exitCode` to set the exit code instead of calling `process.exit()` directly.
- This ensures a cleaner and more predictable shutdown process.

[deepsource-io]

Here's the code health analysis summary for commits bc03a25..b900c5c. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	❌ Failure	❗ 1 occurence introduced 🎯 1 occurence resolved	View Check ↗

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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