fix: #1574 & Clear CJS cache and reload plugins on install

Add support for clearing CommonJS module cache when unloading plugins and reload plugins on install. PluginLoader now uses createRequire to access require.cache and exposes clearCache(pluginPath) to remove cached modules under the plugin directory; plugin manager calls this when unloading. Web UI backend install handlers now reload an existing plugin (with progress updates) instead of skipping registration, ensuring updated code/metadata take effect.

packages/napcat-onebot/network/plugin-manger.ts

@@ -179,6 +179,9 @@ export class OB11PluginMangerAdapter extends IOB11NetworkAdapter<PluginConfig> i
       this.pluginRouters.delete(entry.id);
     }
 
+    // 清理模块缓存
+    this.loader.clearCache(entry.pluginPath);
+
     // 重置状态
     entry.loaded = false;
     entry.runtime = {

packages/napcat-onebot/network/plugin/loader.ts

@@ -1,5 +1,7 @@
 import fs from 'fs';
 import path from 'path';
+import { createRequire } from 'module';
+const require = createRequire(import.meta.url);
 import { LogWrapper } from 'napcat-core/helper/log';
 import {
   PluginPackageJson,
@@ -295,4 +297,24 @@ export class PluginLoader {
 
     return null;
   }
+  /**
+   * 清除插件文件的 require 缓存
+   * 用于确保卸载插件时清理 CJS 模块缓存
+   */
+  clearCache (pluginPath: string): void {
+    try {
+      // 规范化路径以确保匹配正确
+      const normalizedPluginPath = path.resolve(pluginPath);
+
+      // 遍历缓存并删除属于该插件目录的模块
+      Object.keys(require.cache).forEach((id) => {
+        if (id.startsWith(normalizedPluginPath)) {
+          delete require.cache[id];
+          this.logger.logDebug(`[PluginLoader] Cleared cache for: ${id}`);
+        }
+      });
+    } catch (e) {
+      this.logger.logError('[PluginLoader] Error clearing module cache:', e);
+    }
+  }
 }