fix(web): 恢复视频继续播放和进度保存

- 将播放器收敛为单个共享实例，避免列表/网格内多个 video ref 导致进度保存失效
- 恢复视频播放器上方的继续播放提示
- 在播放、暂停、拖动、结束、切换页面和离开页面时保存播放位置
- 保留文件浏览分页和排序参数的前端调用

FileShare-Services/Services/FileLibrary/FileLibraryContracts.cs

@@ -64,7 +64,7 @@ namespace FileShare_Services.Services.FileLibrary
     /// </summary>
     public sealed record SaveFileProgressRequest(
         [property: JsonPropertyName("id")] int Id,
-        [property: JsonPropertyName("position")] double Position);
+        [property: JsonPropertyName("position")] double? Position);
 
     /// <summary>
     /// 分页搜索已扫描文件的请求。
@@ -74,7 +74,9 @@ namespace FileShare_Services.Services.FileLibrary
         [property: JsonPropertyName("pageSize")] int PageSize = 24,
         [property: JsonPropertyName("mediaType")] string? MediaType = null,
         [property: JsonPropertyName("keyword")] string? Keyword = null,
-        [property: JsonPropertyName("rootId")] int RootId = 0);
+        [property: JsonPropertyName("rootId")] int RootId = 0,
+        [property: JsonPropertyName("sortBy")] string? SortBy = null,
+        [property: JsonPropertyName("sortDirection")] string? SortDirection = null);
 
     /// <summary>
     /// 磁盘驱动器信息。
@@ -121,6 +123,7 @@ namespace FileShare_Services.Services.FileLibrary
         string Extension,
         long SizeBytes,
         DateTime LastWriteTimeUtc,
+        DateTime? FileCreationTimeUtc,
         string MediaType,
         string ContentType,
         string StreamUrl,
@@ -136,7 +139,12 @@ namespace FileShare_Services.Services.FileLibrary
     /// </summary>
     public sealed record BrowseDirectoryRequest(
         [property: JsonPropertyName("rootId")] int RootId = 0,
-        [property: JsonPropertyName("path")] string? Path = null);
+        [property: JsonPropertyName("path")] string? Path = null,
+        [property: JsonPropertyName("page")] int Page = 1,
+        [property: JsonPropertyName("pageSize")] int PageSize = 48,
+        [property: JsonPropertyName("mediaType")] string? MediaType = null,
+        [property: JsonPropertyName("sortBy")] string? SortBy = "name",
+        [property: JsonPropertyName("sortDirection")] string? SortDirection = "asc");
 
     /// <summary>
     /// 浏览文件库目录的响应，包含当前路径、子目录列表和文件列表。
@@ -144,7 +152,11 @@ namespace FileShare_Services.Services.FileLibrary
     public sealed record BrowseDirectoryResponse(
         string CurrentPath,
         List<string> Subdirectories,
-        List<FileRecordDto> Files);
+        List<FileRecordDto> Files,
+        int Total,
+        int Page,
+        int PageSize,
+        int TotalPages);
 
     /// <summary>
     /// 文本文件预览内容，支持截断标记。