添加会话数量显示与清除功能

添加会话清除功能，增强安全性，避免账号被盗等情况泄露源代码
账号列表点击测试后显示账号的会话数量
设置页添加自动清除开关，每次调用后清除被调用账号的所有会话

webui/src/features/settings/SettingsContainer.jsx

@@ -5,6 +5,7 @@ import { useSettingsForm } from './useSettingsForm'
 import SecuritySection from './SecuritySection'
 import RuntimeSection from './RuntimeSection'
 import BehaviorSection from './BehaviorSection'
+import AutoDeleteSection from './AutoDeleteSection'
 import ModelSection from './ModelSection'
 import BackupSection from './BackupSection'
 
@@ -91,6 +92,8 @@ export default function SettingsContainer({ onRefresh, onMessage, authFetch, onF
 
             <BehaviorSection t={t} form={form} setForm={setForm} />
 
+            <AutoDeleteSection t={t} form={form} setForm={setForm} />
+
             <ModelSection t={t} form={form} setForm={setForm} />
 
             <BackupSection