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/Finance/Transactions.tsx

@@ -35,42 +35,6 @@ const Transactions: React.FC = () => {
       setLoading(false);
     }
   };
-        },
-        {
-          id: '2',
-          transactionId: 'TRX-2026-002',
-          amount: 5000,
-          type: 'expense',
-          category: 'Suppliers',
-          description: 'Supplier payment',
-          date: '2026-03-16',
-          status: 'completed',
-        },
-        {
-          id: '3',
-          transactionId: 'TRX-2026-003',
-          amount: 2000,
-          type: 'expense',
-          category: 'Marketing',
-          description: 'Ad spend',
-          date: '2026-03-17',
-          status: 'completed',
-        },
-        {
-          id: '4',
-          transactionId: 'TRX-2026-004',
-          amount: 15000,
-          type: 'income',
-          category: 'Sales',
-          description: 'Product sales',
-          date: '2026-03-18',
-          status: 'pending',
-        },
-      ];
-      setTransactions(mockTransactions);
-      setLoading(false);
-    }, 500);
-  };
 
   const handleExport = () => {
     message.success('交易记录已导出');