feat(system):优化后端

1.新增后端测试
2.增加了后端的加密
3.增加了i18n（国际化）

frontend/src/components/Plugin/ToolSettings.tsx

@@ -1,8 +1,10 @@
 import { useState, useEffect } from 'react';
-import { Package, Wrench } from 'lucide-react';
+import { useTranslation } from 'react-i18next';
+import { Package, Wrench, Loader2, Box } from 'lucide-react';
 import apiClient from '../../api/client';
 
 export function ToolSettings() {
+  const { t } = useTranslation();
   const [tools, setTools] = useState<string[]>([]);
   const [loading, setLoading] = useState(true);
 
@@ -25,23 +27,29 @@ export function ToolSettings() {
       <div>
         <div className="flex items-center gap-2 mb-1">
           <Wrench size={16} className="text-accent" />
-          <h3 className="text-lg font-bold text-text-primary">Installed Tools</h3>
+          <h3 className="text-lg font-bold text-text-primary">{t('plugin.toolManagement')}</h3>
         </div>
-        <p className="text-sm text-text-muted">Manage agent tools and functions</p>
+        <p className="text-sm text-text-muted">{t('plugin.toolDesc')}</p>
       </div>
 
       <div className="bg-bg-card border border-border-primary rounded-2xl shadow-sm overflow-hidden">
         <div className="px-6 py-4 border-b border-border-primary flex justify-between items-center bg-bg-secondary">
           <div>
-            <h4 className="text-sm font-bold text-text-primary">Available Tools</h4>
-            <p className="text-[11px] text-text-muted">Installed tools for agents</p>
+            <h4 className="text-sm font-bold text-text-primary">{t('plugin.availableTools')}</h4>
+            <p className="text-[11px] text-text-muted">{t('plugin.toolSubDesc')}</p>
           </div>
         </div>
         <div className="p-6">
           {loading ? (
-            <div className="text-text-muted text-sm">Loading tools...</div>
+            <div className="flex flex-col items-center justify-center py-12 text-text-muted">
+              <Loader2 size={24} className="animate-spin mb-3" />
+              <span className="text-sm">{t('common.loading')}</span>
+            </div>
           ) : tools.length === 0 ? (
-            <div className="text-text-muted text-sm">No tools installed yet.</div>
+            <div className="flex flex-col items-center justify-center py-12 text-text-muted">
+              <Box size={32} className="mb-3 opacity-40" />
+              <span className="text-sm">{t('plugin.noTools')}</span>
+            </div>
           ) : (
             <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
               {tools.map((tool) => (