feat: 添加顾客权限控制和订单时间限制

src/main/java/com/example/building/entity/SystemConfig.java

@@ -0,0 +1,38 @@
+package com.example.building.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * 系统配置实体
+ */
+@Data
+@TableName("system_config")
+public class SystemConfig {
+
+    @TableId(type = IdType.ASSIGN_UUID)
+    private String configId;
+
+    /**
+     * 配置键
+     */
+    private String configKey;
+
+    /**
+     * 配置值
+     */
+    private String configValue;
+
+    /**
+     * 备注
+     */
+    private String remark;
+
+    @TableField(fill = FieldFill.INSERT)
+    private LocalDateTime createdAt;
+
+    @TableField(fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updatedAt;
+}