fix(auth): 5 BUG 修复 — refresh token 持久化 + 密码验证 + 浏览器兼容

BUG-1 (P1): LoginPage 注册密码验证从 6 位改为 8 位，与后端一致
BUG-2 (P0): refresh token 持久化到 OS keyring + restoreSession 三级恢复
  (access token → refresh token → cookie auth) + saveSaaSSession 改为 await
BUG-3 (P0): Tauri 聊天路由降级问题，根因同 BUG-2（会话恢复失败）
BUG-4 (P1): App.tsx 跳过 Onboarding 改用 agentStore（兼容所有 client），
  Workspace.tsx Tauri invoke 改为动态 import 避免浏览器崩溃
BUG-5: tauri.conf.json createUpdaterArtifacts 改为 boolean true

desktop/src/App.tsx

@@ -404,32 +404,33 @@ function App() {
         onClose={async () => {
           // Skip onboarding but still create a default agent with default personality
           try {
-            const { getGatewayClient } = await import('./lib/gateway-client');
-            const client = getGatewayClient();
-            if (client) {
-              // Create default agent with versatile assistant personality
-              const defaultAgent = await client.createClone({
-                name: '全能助手',
-                role: '全能型 AI 助手',
-                nickname: '小龙',
-                emoji: '🦞',
-                personality: 'friendly',
-                scenarios: ['coding', 'writing', 'research', 'product', 'data'],
-                userName: 'User',
-                userRole: 'user',
-                communicationStyle: '亲切、耐心、善解人意，用易懂的语言解释复杂概念',
-              });
+            // Use agentStore (which uses the correct client from connectionStore)
+            // instead of directly importing getGatewayClient
+            const { useAgentStore } = await import('./store/agentStore');
+            const agentStore = useAgentStore.getState();
 
-              if (defaultAgent?.clone) {
-                setCurrentAgent({
-                  id: defaultAgent.clone.id,
-                  name: defaultAgent.clone.name,
-                  icon: defaultAgent.clone.emoji || '🦞',
-                  color: 'bg-gradient-to-br from-orange-500 to-red-500',
-                  lastMessage: defaultAgent.clone.role || '全能型 AI 助手',
-                  time: '',
-                });
-              }
+            // Create default agent with versatile assistant personality
+            const result = await agentStore.createClone({
+              name: '全能助手',
+              role: '全能型 AI 助手',
+              nickname: '小龙',
+              emoji: '🦞',
+              personality: 'friendly',
+              scenarios: ['coding', 'writing', 'research', 'product', 'data'],
+              userName: 'User',
+              userRole: 'user',
+              communicationStyle: '亲切、耐心、善解人意，用易懂的语言解释复杂概念',
+            });
+
+            if (result) {
+              setCurrentAgent({
+                id: result.id,
+                name: result.name,
+                icon: result.emoji || '🦞',
+                color: 'bg-gradient-to-br from-orange-500 to-red-500',
+                lastMessage: result.role || '全能型 AI 助手',
+                time: '',
+              });
             }
           } catch (err) {
             log.warn('Failed to create default agent on skip:', err);