添加配置管理功能，包括获取和设置配置值的接口及实现

Entity/ConfigEntity.cs

@@ -0,0 +1,31 @@
+namespace Entity;
+
+/// <summary>
+/// 配置实体
+/// </summary>
+[Table(Name = "Config")]
+public class ConfigEntity : BaseEntity
+{
+    /// <summary>
+    /// 配置Key
+    /// </summary>
+    public string Key { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 配置Value
+    /// </summary>
+    public string Value { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 配置类型
+    /// </summary>
+    public ConfigType Type { get; set; }
+}
+
+public enum ConfigType
+{
+    Boolean,
+    String,
+    Json,
+    Number
+}