aspectran / aspectran / #4665

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Fix(jetty): Prevent Logback context shutdown on restart

When running in the Aspectran Shell, restarting the service via the `restart` command would cause all Logback logging to cease.

This was caused by Jetty's `WebAppContext` automatically discovering and running Logback's `LogbackServletContainerInitializer`. This initializer registers a `LogbackServletContextListener` that, upon the web application's context destruction during the restart, would shut down the entire shared, JVM-wide `LoggerContext`.

This commit fixes the issue by preventing the `LogbackServletContainerInitializer` from running. It achieves this by programmatically setting the standard Logback context parameter `logbackDisableServletContainerInitializer` to `true` for every `JettyWebAppContext` instance.

The implementation is:
- Located in `JettyServer.handleDeferredInitialize()` to ensure it covers all web applications managed by the server.
- Defensive: It uses reflection to confirm that Logback is the active SLF4J implementation before applying the fix, thus avoiding a hard dependency.

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