chore: bump version to 2.8.6 in package.json and add global AI assistant settings in locales and AccountSettingSystem.vue

src/locales/en-US.ts

@@ -1256,6 +1256,8 @@ export default {
       llmApiKeyPlaceholder: 'Please enter API key',
       llmBaseUrl: 'LLM Base URL',
       llmBaseUrlHint: 'Base URL for LLM API, used for custom API endpoints',
+      aiAgentGlobal: 'Global AI Assistant',
+      aiAgentGlobalHint: 'Enable global AI assistant functionality, all message conversations will be answered by the AI agent without using the /ai command',
       advancedSettings: 'Advanced Settings',
       advancedSettingsDesc: 'System advanced settings, only need to be adjusted in special cases',
       downloaders: 'Downloaders',

src/locales/zh-CN.ts

@@ -1252,6 +1252,8 @@ export default {
       llmApiKeyPlaceholder: '请输入API密钥',
       llmBaseUrl: 'LLM基础URL',
       llmBaseUrlHint: 'LLM API的基础URL地址，用于自定义API端点',
+      aiAgentGlobal: '全局智能助手',
+      aiAgentGlobalHint: '启用全局智能助手功能，所有消息对话均使用智能体回答而不用使用/ai命令',
       advancedSettings: '高级设置',
       advancedSettingsDesc: '系统进阶设置，特殊情况下才需要调整',
       downloaders: '下载器',

src/locales/zh-TW.ts

@@ -1240,6 +1240,8 @@ export default {
       llmApiKeyPlaceholder: '請輸入API密鑰',
       llmBaseUrl: 'LLM基礎URL',
       llmBaseUrlHint: 'LLM API的基礎URL地址，用於自定義API端點',
+      aiAgentGlobal: '全局智能助手',
+      aiAgentGlobalHint: '啟用全局智能助手功能，所有消息對話均使用智能體回答而不用使用/ai命令',
       advancedSettings: '高級設置',
       advancedSettingsDesc: '系統進階設置，特殊情況下才需要調整',
       downloaders: '下載器',