完善系统参数配置和数据字典管理模块

Model/Dto/System/DictDto.cs

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+namespace Model.Dto.System
+{
+    /// <summary>
+    /// 数据字典分类 DTO
+    /// </summary>
+    public class DictTypeDto
+    {
+        public string Id { get; set; }
+        public string Code { get; set; }
+        public string Name { get; set; }
+        public byte Status { get; set; }
+        public int Sort { get; set; }
+        public string? Remark { get; set; }
+        public DateTime? CreateTime { get; set; }
+        /// <summary>该分类下的字典项数量（列表展示用，由 Service 填充）</summary>
+        public int ItemCount { get; set; }
+    }
+
+    /// <summary>
+    /// 数据字典项 DTO
+    /// </summary>
+    public class DictItemDto
+    {
+        public string Id { get; set; }
+        public string TypeId { get; set; }
+        public string Code { get; set; }
+        public string Name { get; set; }
+        public int Sort { get; set; }
+        public byte Status { get; set; }
+        public byte IsDefault { get; set; }
+        public string? Remark { get; set; }
+        public DateTime? CreateTime { get; set; }
+    }
+
+    /// <summary>
+    /// 字典项下拉选项（业务侧通过 typeCode 查询用：仅返回编码+文本+是否默认）
+    /// </summary>
+    public class DictOptionDto
+    {
+        public string Code { get; set; }
+        public string Name { get; set; }
+        public bool IsDefault { get; set; }
+    }
+}

Model/Dto/System/FileStorageDto.cs

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+namespace Model.Dto.System
+{
+    /// <summary>
+    /// 文件存储配置 DTO
+    /// </summary>
+    public class FileStorageConfigDto
+    {
+        public string Id { get; set; }
+        public string Provider { get; set; }
+        public string Name { get; set; }
+        public string? Endpoint { get; set; }
+        /// <summary>回显时掩码（仅显示前后各 2 字符）；写入时若为掩码样式则保留原值不变</summary>
+        public string? AccessKey { get; set; }
+        public string? SecretKey { get; set; }
+        public string? Bucket { get; set; }
+        public string? Region { get; set; }
+        public string? BasePath { get; set; }
+        public int MaxSizeMB { get; set; }
+        public string? AllowedExts { get; set; }
+        public byte IsDefault { get; set; }
+        public byte Status { get; set; }
+        public string? Remark { get; set; }
+        public DateTime? CreateTime { get; set; }
+    }
+
+    /// <summary>
+    /// 文件上传记录 DTO
+    /// </summary>
+    public class FileRecordDto
+    {
+        public string Id { get; set; }
+        public string FileName { get; set; }
+        public string? OriginalName { get; set; }
+        public string? Url { get; set; }
+        public long Size { get; set; }
+        public string? Ext { get; set; }
+        public string? Provider { get; set; }
+        public string StorageId { get; set; }
+        public string? Uploader { get; set; }
+        public string? BizType { get; set; }
+        public string? BizId { get; set; }
+        public DateTime? CreateTime { get; set; }
+    }
+
+    /// <summary>
+    /// 上传结果（Provider 返回，Service 写入 sys_file_record 时用）
+    /// </summary>
+    public class FileUploadResultDto
+    {
+        /// <summary>存储后的相对文件名（含路径，如 2026/09/18/snowflake.jpg）</summary>
+        public string FileName { get; set; }
+        /// <summary>访问 URL</summary>
+        public string Url { get; set; }
+        /// <summary>扩展名</summary>
+        public string? Ext { get; set; }
+        /// <summary>文件大小（字节）</summary>
+        public long Size { get; set; }
+        public string Provider { get; set; }
+    }
+}

Model/Dto/System/SystemParamDto.cs

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+namespace Model.Dto.System
+{
+    /// <summary>
+    /// 系统参数 DTO
+    /// </summary>
+    public class SystemParamDto
+    {
+        public string Id { get; set; }
+        public string ParamKey { get; set; }
+        public string ParamName { get; set; }
+        public string? ParamValue { get; set; }
+        /// <summary>值类型（0=int, 1=text, 2=enum, 3=json）</summary>
+        public byte ParamType { get; set; }
+        /// <summary>枚举选项（原始 JSON 字符串，由前端解析；仅 ParamType=enum 有值）</summary>
+        public string? ParamOptions { get; set; }
+        public string? Unit { get; set; }
+        public string? Group { get; set; }
+        public int Sort { get; set; }
+        public string? Remark { get; set; }
+        /// <summary>是否系统内置（1=不可删，仅允许改 Value）</summary>
+        public byte IsSystem { get; set; }
+        public string? LastUpdateUser { get; set; }
+        public DateTime? LastUpdateTime { get; set; }
+        public DateTime? CreateTime { get; set; }
+    }
+
+    /// <summary>
+    /// 业务侧批量取值返回项
+    /// </summary>
+    public class SystemParamValueDto
+    {
+        public string Key { get; set; }
+        public string? Value { get; set; }
+    }
+}