fix: log plugin enabled/disabled status during initialization

Previously plugins that failed init() were silently removed from storage.
Now logs at INFO level whether each plugin is enabled or disabled.

searx/plugins/_core.py

@@ -248,7 +248,10 @@ class PluginStorage:
 
         for plg in self.plugin_list.copy():
             if not plg.init(app):
+                plg.log.info("plugin is disabled (init returned False)")
                 self.plugin_list.remove(plg)
+            else:
+                plg.log.info("plugin is enabled")
 
     def pre_search(self, request: SXNG_Request, search: "SearchWithPlugins") -> bool: