fix: correctly apply auto_unload setting from config (#5953)

Previously, the `autoUnload` flag was not being updated when set via config,
causing models to be auto-unloaded regardless of the intended behavior.
This patch ensures the setting is respected at runtime.

extensions/llamacpp-extension/src/index.ts

@@ -779,6 +779,8 @@ export default class llamacpp_extension extends AIEngine {
         await this.ensureBackendReady(backend, version)
       }
       closure()
+    } else if (key === 'auto_unload') {
+        this.autoUnload = value as boolean
     }
   }