feat: 添加汇率服务和缓存服务，优化数据源和日志服务

refactor: 重构数据源工厂和类型定义，提升代码可维护性

fix: 修复类型转换和状态机文档中的错误

docs: 更新服务架构文档，添加新的服务闭环流程

test: 添加汇率服务单元测试

chore: 清理无用代码和注释，优化代码结构

dashboard/src/pages/Settings/SystemSettings.tsx

@@ -7,7 +7,6 @@ import { settingsDataSource, PlatformAccount, ExchangeRate, CostTemplate, WinNod
 const { Option } = Select;
 const { TabPane } = Tabs;
 const { TextArea } = Input;
-}
 
 const SystemSettings: React.FC = () => {
   const [activeTab, setActiveTab] = useState('platform');

dashboard/src/pages/Settings/UserManagement.tsx

@@ -34,26 +34,6 @@ const UserManagement: React.FC = () => {
       setLoading(false);
     }
   };
-          email: 'bob.johnson@example.com',
-          role: 'OPERATOR',
-          status: 'active',
-          createdAt: '2026-01-03',
-          lastLogin: '2026-03-15',
-        },
-        {
-          id: '4',
-          name: 'Alice Brown',
-          email: 'alice.brown@example.com',
-          role: 'FINANCE',
-          status: 'inactive',
-          createdAt: '2026-01-04',
-          lastLogin: '2026-03-10',
-        },
-      ];
-      setUsers(mockUsers);
-      setLoading(false);
-    }, 500);
-  };
 
   const handleAddUser = () => {
     setIsModalVisible(true);

dashboard/src/pages/Settings/index.tsx

@@ -52,6 +52,7 @@ import {
   QuestionCircleOutlined,
   SaveOutlined,
   ReloadOutlined,
+  DollarOutlined,
 } from '@ant-design/icons';
 import type { ColumnsType } from 'antd/es/table';
 import moment from 'moment';