feat(backend): 开发订单管理和供应商管理功能

- 新增订单管理页面，实现订单列表展示、搜索、分页等功能
- 新增供应商管理页面，实现供应商列表展示、搜索、分页等功能- 添加订单和供应商相关模型及数据库迁移
- 实现订单状态更新和供应商信息编辑功能
- 优化后端路由结构，移除不必要的代码

backend/models/index.js

@@ -124,7 +124,73 @@ const models = {
   }),
   
   // 订单模型
-  Order: defineOrder(sequelize)
+  Order: defineOrder(sequelize),
+  
+  // 供应商模型
+  Supplier: sequelize.define('Supplier', {
+    id: {
+      type: Sequelize.BIGINT,
+      primaryKey: true,
+      autoIncrement: true
+    },
+    name: {
+      type: Sequelize.STRING(100),
+      allowNull: false
+    },
+    code: {
+      type: Sequelize.STRING(20),
+      allowNull: false,
+      unique: true
+    },
+    contact: {
+      type: Sequelize.STRING(50),
+      allowNull: false
+    },
+    phone: {
+      type: Sequelize.STRING(20),
+      allowNull: false,
+      unique: true
+    },
+    address: {
+      type: Sequelize.STRING(200),
+      allowNull: false
+    },
+    businessLicense: {
+      type: Sequelize.STRING(255)
+    },
+    qualificationLevel: {
+      type: Sequelize.STRING(10),
+      allowNull: false
+    },
+    certifications: {
+      type: Sequelize.JSON
+    },
+    cattleTypes: {
+      type: Sequelize.JSON
+    },
+    capacity: {
+      type: Sequelize.INTEGER
+    },
+    rating: {
+      type: Sequelize.DECIMAL(3, 2)
+    },
+    cooperationStartDate: {
+      type: Sequelize.DATE
+    },
+    status: {
+      type: Sequelize.ENUM('active', 'inactive', 'suspended'),
+      defaultValue: 'active'
+    },
+    region: {
+      type: Sequelize.STRING(20),
+      allowNull: false
+    }
+  }, {
+    tableName: 'suppliers',
+    timestamps: true,
+    createdAt: 'created_at',
+    updatedAt: 'updated_at'
+  })
 };
 
 // 同步数据库模型
@@ -138,6 +204,10 @@ const syncModels = async () => {
     await models.Order.sync({ alter: true });
     console.log('✅ 订单表同步成功');
     
+    // 同步供应商表（如果不存在则创建）
+    await models.Supplier.sync({ alter: true });
+    console.log('✅ 供应商表同步成功');
+    
     console.log('✅ 数据库模型同步完成');
   } catch (error) {
     console.error('❌ 数据库模型同步失败:', error);