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/Suppliers/index.tsx

@@ -32,54 +32,6 @@ const Suppliers: React.FC = () => {
       setLoading(false);
     }
   };
-          rating: 4.5,
-          leadTime: 7,
-          minOrder: 100,
-        },
-        {
-          id: '2',
-          name: 'Supplier B',
-          contactName: 'Jane Smith',
-          email: 'jane@supplier-b.com',
-          phone: '+1 (987) 654-3210',
-          address: '456 Oak Ave, Los Angeles, CA',
-          category: 'Clothing',
-          status: 'active',
-          rating: 4.2,
-          leadTime: 5,
-          minOrder: 50,
-        },
-        {
-          id: '3',
-          name: 'Supplier C',
-          contactName: 'Bob Johnson',
-          email: 'bob@supplier-c.com',
-          phone: '+1 (555) 123-4567',
-          address: '789 Pine Rd, Chicago, IL',
-          category: 'Home Goods',
-          status: 'inactive',
-          rating: 3.8,
-          leadTime: 10,
-          minOrder: 200,
-        },
-        {
-          id: '4',
-          name: 'Supplier D',
-          contactName: 'Alice Brown',
-          email: 'alice@supplier-d.com',
-          phone: '+1 (222) 333-4444',
-          address: '321 Cedar St, Miami, FL',
-          category: 'Electronics',
-          status: 'pending',
-          rating: 4.0,
-          leadTime: 3,
-          minOrder: 75,
-        },
-      ];
-      setSuppliers(mockSuppliers);
-      setLoading(false);
-    }, 500);
-  };
 
   const handleAddSupplier = () => {
     message.info('添加供应商功能开发中');