Add plugin management to WebUI backend and frontend

Implemented backend API and router for plugin management (list, reload, enable/disable, uninstall) and exposed corresponding frontend controller and dashboard page. Updated navigation and site config to include plugin management. Refactored plugin manager adapter for public methods and improved plugin metadata handling.

packages/napcat-webui-frontend/src/controllers/plugin_manager.ts

@@ -0,0 +1,35 @@
+import { serverRequest } from '@/utils/request';
+
+export interface PluginItem {
+  name: string;
+  version: string;
+  description: string;
+  author: string;
+  status: 'active' | 'disabled';
+  filename?: string;
+}
+
+export interface ServerResponse<T> {
+  code: number;
+  message: string;
+  data: T;
+}
+
+export default class PluginManager {
+  public static async getPluginList () {
+    const { data } = await serverRequest.get<ServerResponse<PluginItem[]>>('/Plugin/List');
+    return data.data;
+  }
+
+  public static async reloadPlugin (name: string) {
+    await serverRequest.post<ServerResponse<void>>('/Plugin/Reload', { name });
+  }
+
+  public static async setPluginStatus (name: string, enable: boolean, filename?: string) {
+    await serverRequest.post<ServerResponse<void>>('/Plugin/SetStatus', { name, enable, filename });
+  }
+
+  public static async uninstallPlugin (name: string, filename?: string) {
+    await serverRequest.post<ServerResponse<void>>('/Plugin/Uninstall', { name, filename });
+  }
+}