change app plugins to be a map to prevent duplicates and provide easier access

app/src/modules/server/SystemController.ts

@@ -322,7 +322,7 @@ export class SystemController extends Controller {
                   local: datetimeStringLocal(),
                   utc: datetimeStringUTC(),
                },
-               plugins: this.app.plugins.map((p) => p.name),
+               plugins: Array.from(this.app.plugins.keys()),
             }),
       );