fix(desktop): 修复 10 个 agent 对话测试发现的缺陷

- BUG-001+002 P0: 模型选择器合并 SaaS 可用模型列表
- BUG-003 P1: 修复 relay 错误消息重复显示
- BUG-005 P1: 设置页面显示实际连接模式和地址
- BUG-006 P2: 统一 UI 语言为中文
- BUG-009 P3: 错误时隐藏建议按钮
- BUG-010 P3: 密码切换按钮添加 aria-label

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/components/Settings/General.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react';
 import { useConnectionStore } from '../../store/connectionStore';
 import { useConfigStore } from '../../store/configStore';
 import { useConversationStore } from '../../store/chat/conversationStore';
+import { useSaaSStore } from '../../store/saasStore';
 import { getStoredGatewayToken, setStoredGatewayToken } from '../../lib/gateway-client';
 import { silentErrorHandler } from '../../lib/error-utils';
 
@@ -22,6 +23,7 @@ export function General() {
 
   const connected = connectionState === 'connected';
   const connecting = connectionState === 'connecting' || connectionState === 'reconnecting';
+  const saasUrl = useSaaSStore((s) => s.saasUrl);
 
   // 同步主题设置
   useEffect(() => {
@@ -97,7 +99,9 @@ export function General() {
         </div>
         <div className="flex justify-between items-center">
           <span className="text-sm text-gray-700">地址</span>
-          <span className="text-sm text-gray-500 font-mono">ws://127.0.0.1:50051</span>
+          <span className="text-sm text-gray-500 font-mono">
+            {gatewayVersion === 'saas-relay' && saasUrl ? saasUrl : 'ws://127.0.0.1:50051'}
+          </span>
         </div>
         <div className="flex justify-between items-center">
           <span className="text-sm text-gray-700">Token</span>