- Reorder mutex lock acquisition to the start of the function
- Early return if server is not running
- Use defer for executing shutdown hooks
- Simplify nil check for hooks
- Remove TODO comment

This commit improves the readability, robustness, and execution order
of the shutdown process. It ensures consistent state throughout the
shutdown and guarantees hook execution even in error cases.

- Add shutdown hook verification
- Implement better synchronization with channels
- Improve error handling and assertions
- Adjust timeouts for more consistent results
- Add server state check after shutdown attempt
- Include comments explaining expected behavior

This commit improves the comprehensiveness and reliability of the
ShutdownWithContext test, ensuring proper verification of shutdown
hooks, timeout behavior, and server state during long-running requests.

…th-context

…e/improve-shutdown-with-context

…ub.com:JIeJaitt/fiber into jiejaitt-feature/improve-shutdown-with-context

…main' of github.com:JIeJaitt/fiber into jiejaitt-feature/improve-shutdown-with-context

…e/improve-shutdown-with-context

- Reorder mutex lock acquisition to the start of the function
- Early return if server is not running
- Use defer for executing shutdown hooks
- Simplify nil check for hooks
- Remove TODO comment

This commit improves the readability, robustness, and execution order
of the shutdown process. It ensures consistent state throughout the
shutdown and guarantees hook execution even in error cases.

- Add shutdown hook verification
- Implement better synchronization with channels
- Improve error handling and assertions
- Adjust timeouts for more consistent results
- Add server state check after shutdown attempt
- Include comments explaining expected behavior

This commit improves the comprehensiveness and reliability of the
ShutdownWithContext test, ensuring proper verification of shutdown
hooks, timeout behavior, and server state during long-running requests.

…ub.com:JIeJaitt/fiber into jiejaitt-feature/improve-shutdown-with-context

…/improve-shutdown-with-context

…/improve-shutdown-with-context

…/improve-shutdown-with-context