Initial commit

Models/Request/Tag/CreateTagRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Foxel.Models.Request.Tag;
+
+public class CreateTagRequest
+{
+    [Required]
+    [StringLength(50)]
+    public string Name { get; set; } = string.Empty;
+    
+    [StringLength(200)]
+    public string? Description { get; set; }
+}

Models/Request/Tag/FilteredTagsRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Foxel.Models.Request.Tag
+{
+    public class FilteredTagsRequest
+    {
+        [Range(1, int.MaxValue, ErrorMessage = "页码必须大于0")]
+        public int Page { get; set; } = 1;
+
+        [Range(1, 100, ErrorMessage = "每页数量必须在1-100之间")]
+        public int PageSize { get; set; } = 20;
+        
+        public string? SearchQuery { get; set; }
+        
+        // 排序方式：name, pictureCount, createdAt
+        public string? SortBy { get; set; } = "pictureCount";
+        
+        // 排序方向：asc, desc
+        public string? SortDirection { get; set; } = "desc";
+    }
+}

Models/Request/Tag/UpdateTagRequest.cs

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+namespace Foxel.Models.Request.Tag;
+
+public class UpdateTagRequest : CreateTagRequest
+{
+    public int Id { get; set; }
+}