feat: add plugin system

src/plugins/index.ts

@@ -1,2 +1,22 @@
-export { init as Monofile } from './monofile'
-export { init as Themes } from './themes'
+import { PluginManager } from './core/manager';
+import timetablePlugin from './built-in/timetable';
+import notificationCollectorPlugin from './built-in/notificationCollector';
+
+// Initialize plugin manager
+const pluginManager = PluginManager.getInstance();
+
+// Register built-in plugins
+pluginManager.registerPlugin(timetablePlugin);
+pluginManager.registerPlugin(notificationCollectorPlugin);
+
+// Legacy plugin exports
+export { init as Monofile } from './monofile';
+export { init as Themes } from './themes';
+
+// New plugin system initialization
+export async function initializePlugins(): Promise<void> {
+  await pluginManager.startAllPlugins();
+}
+
+// Re-export plugin manager for direct access if needed
+export { pluginManager };