fix(AI,Web): Optimize the experience

Services/AI/AiService.cs

@@ -17,13 +17,27 @@ public class AiService(IHttpClientFactory httpClientFactory, IConfigService conf
         string apiKey = configService["AI:ApiKey"];
         string baseUrl = configService["AI:ApiEndpoint"];
 
+        if (string.IsNullOrWhiteSpace(apiKey))
+        {
+            throw new InvalidOperationException("AI API Key 未配置或为空。请检查配置文件中的 AI:ApiKey 设置。");
+        }
+
+        if (string.IsNullOrWhiteSpace(baseUrl))
+        {
+            throw new InvalidOperationException("AI API Endpoint 未配置或为空。请检查配置文件中的 AI:ApiEndpoint 设置。");
+        }
+
+        if (!Uri.TryCreate(baseUrl, UriKind.Absolute, out Uri? validUri))
+        {
+            throw new InvalidOperationException($"AI API Endpoint 格式无效: {baseUrl}。请提供有效的 URL。");
+        }
+
         if (_httpClient == null || _currentApiKey != apiKey || _currentBaseUrl != baseUrl)
         {
+            _httpClient?.Dispose();
             _httpClient = httpClientFactory.CreateClient();
-            _httpClient.BaseAddress = new Uri(baseUrl);
+            _httpClient.BaseAddress = validUri;
             _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
-            
-            // 更新当前配置记录
             _currentApiKey = apiKey;
             _currentBaseUrl = baseUrl;
         }

Web/src/layouts/components/Header.tsx

@@ -13,7 +13,7 @@ import { Link, useNavigate, useLocation } from 'react-router';
 import { useAuth } from '../../auth/AuthContext';
 import { getMainRoutes, getAdminRoutes, type RouteConfig } from '../../routes';
 import UserAvatar from '../../components/UserAvatar';
-import { UserRole } from '../../api/types';
+import { UserRole } from '../../api';
 import SearchDialog from '../../components/search/SearchDialog';
 import useIsMobile from '../../hooks/useIsMobile';
 

Web/src/layouts/components/Sidebar.tsx

@@ -181,7 +181,7 @@ const Sidebar: React.FC<SidebarProps> = ({ collapsed, isMobile = false, onClose,
                 height: isMobile ? '56px' : '64px',
                 display: 'flex',
                 alignItems: 'center',
-                justifyContent: collapsed ? 'center' : 'flex-start',
+                justifyContent: 'center',
                 padding: collapsed ? '0' : '0 20px',
                 color: '#001529',
                 fontWeight: 'bold',