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/FileLibraryService.cs

@@ -180,6 +180,7 @@ namespace FileShare_Services.Services.FileLibrary
                     record.Extension = info.Extension.ToLowerInvariant();
                     record.SizeBytes = info.Length;
                     record.LastWriteTimeUtc = info.LastWriteTimeUtc;
+                    record.FileCreationTimeUtc = info.CreationTimeUtc;
                     record.MediaType = mediaType;
                     record.ContentType = contentType;
                     record.Exists = true;
@@ -334,9 +335,7 @@ namespace FileShare_Services.Services.FileLibrary
             }
 
             var total = await query.CountAsync(cancellationToken);
-            var items = await query
-                .OrderBy(file => file.MediaType)
-                .ThenBy(file => file.RelativePath)
+            var items = await ApplyFileSort(query, request.SortBy, request.SortDirection)
                 .Skip((page - 1) * pageSize)
                 .Take(pageSize)
                 .Select(file => ToFileDto(file))
@@ -359,6 +358,9 @@ namespace FileShare_Services.Services.FileLibrary
         public async Task<BrowseDirectoryResponse> BrowseDirectoryAsync(BrowseDirectoryRequest request, CancellationToken cancellationToken = default)
         {
             var rootId = request.RootId;
+            var page = Math.Clamp(request.Page, 1, 100000);
+            var pageSize = Math.Clamp(request.PageSize, 1, 100);
+            var mediaType = request.MediaType?.Trim();
             // URL 友好的正斜杠，用于响应和内存处理
             var prefix = (request.Path ?? "").Trim().Replace('\\', '/').Trim('/');
             // Windows 反斜杠，用于数据库查询
@@ -378,7 +380,7 @@ namespace FileShare_Services.Services.FileLibrary
             var allFiles = await query.ToListAsync(cancellationToken);
 
             var subdirs = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
-            var currentFiles = new List<FileRecordDto>();
+            var currentFiles = new List<ManagedFileRecord>();
 
             foreach (var file in allFiles)
             {
@@ -390,7 +392,7 @@ namespace FileShare_Services.Services.FileLibrary
                 var slashIndex = remaining.IndexOf('/');
                 if (slashIndex < 0)
                 {
-                    currentFiles.Add(ToFileDto(file));
+                    currentFiles.Add(file);
                 }
                 else
                 {
@@ -398,10 +400,28 @@ namespace FileShare_Services.Services.FileLibrary
                 }
             }
 
+            if (!string.IsNullOrWhiteSpace(mediaType) && !mediaType.Equals("all", StringComparison.OrdinalIgnoreCase))
+            {
+                currentFiles = currentFiles
+                    .Where(file => file.MediaType.Equals(mediaType, StringComparison.OrdinalIgnoreCase))
+                    .ToList();
+            }
+
+            var total = currentFiles.Count;
+            var files = ApplyFileSort(currentFiles, request.SortBy, request.SortDirection)
+                .Skip((page - 1) * pageSize)
+                .Take(pageSize)
+                .Select(ToFileDto)
+                .ToList();
+
             return new BrowseDirectoryResponse(
                 prefix,
                 subdirs.OrderBy(d => d, StringComparer.OrdinalIgnoreCase).ToList(),
-                currentFiles);
+                files,
+                total,
+                page,
+                pageSize,
+                pageSize > 0 ? (int)Math.Ceiling((double)total / pageSize) : 0);
         }
 
         /// <inheritdoc />
@@ -586,6 +606,76 @@ namespace FileShare_Services.Services.FileLibrary
             return Math.Clamp(interval ?? DefaultScanIntervalMinutes, 1, 1440);
         }
 
+        private static IQueryable<ManagedFileRecord> ApplyFileSort(
+            IQueryable<ManagedFileRecord> query,
+            string? sortBy,
+            string? sortDirection)
+        {
+            var descending = IsDescending(sortDirection);
+            return NormalizeSortBy(sortBy) switch
+            {
+                "size" => descending
+                    ? query.OrderByDescending(file => file.SizeBytes).ThenBy(file => file.FileName)
+                    : query.OrderBy(file => file.SizeBytes).ThenBy(file => file.FileName),
+                "created" => descending
+                    ? query.OrderByDescending(file => file.FileCreationTimeUtc ?? file.LastWriteTimeUtc).ThenBy(file => file.FileName)
+                    : query.OrderBy(file => file.FileCreationTimeUtc ?? file.LastWriteTimeUtc).ThenBy(file => file.FileName),
+                "modified" => descending
+                    ? query.OrderByDescending(file => file.LastWriteTimeUtc).ThenBy(file => file.FileName)
+                    : query.OrderBy(file => file.LastWriteTimeUtc).ThenBy(file => file.FileName),
+                "type" => descending
+                    ? query.OrderByDescending(file => file.MediaType).ThenByDescending(file => file.Extension).ThenBy(file => file.FileName)
+                    : query.OrderBy(file => file.MediaType).ThenBy(file => file.Extension).ThenBy(file => file.FileName),
+                _ => descending
+                    ? query.OrderByDescending(file => file.FileName).ThenBy(file => file.RelativePath)
+                    : query.OrderBy(file => file.FileName).ThenBy(file => file.RelativePath),
+            };
+        }
+
+        private static IOrderedEnumerable<ManagedFileRecord> ApplyFileSort(
+            IEnumerable<ManagedFileRecord> files,
+            string? sortBy,
+            string? sortDirection)
+        {
+            var descending = IsDescending(sortDirection);
+            return NormalizeSortBy(sortBy) switch
+            {
+                "size" => descending
+                    ? files.OrderByDescending(file => file.SizeBytes).ThenBy(file => file.FileName)
+                    : files.OrderBy(file => file.SizeBytes).ThenBy(file => file.FileName),
+                "created" => descending
+                    ? files.OrderByDescending(file => file.FileCreationTimeUtc ?? file.LastWriteTimeUtc).ThenBy(file => file.FileName)
+                    : files.OrderBy(file => file.FileCreationTimeUtc ?? file.LastWriteTimeUtc).ThenBy(file => file.FileName),
+                "modified" => descending
+                    ? files.OrderByDescending(file => file.LastWriteTimeUtc).ThenBy(file => file.FileName)
+                    : files.OrderBy(file => file.LastWriteTimeUtc).ThenBy(file => file.FileName),
+                "type" => descending
+                    ? files.OrderByDescending(file => file.MediaType).ThenByDescending(file => file.Extension).ThenBy(file => file.FileName)
+                    : files.OrderBy(file => file.MediaType).ThenBy(file => file.Extension).ThenBy(file => file.FileName),
+                _ => descending
+                    ? files.OrderByDescending(file => file.FileName).ThenBy(file => file.RelativePath)
+                    : files.OrderBy(file => file.FileName).ThenBy(file => file.RelativePath),
+            };
+        }
+
+        private static string NormalizeSortBy(string? sortBy)
+        {
+            return sortBy?.Trim().ToLowerInvariant() switch
+            {
+                "size" or "sizebytes" => "size",
+                "created" or "createdat" or "createtime" or "creationtime" => "created",
+                "modified" or "lastwrite" or "lastwritetime" or "lastwritetimeutc" or "time" or "date" => "modified",
+                "type" or "mediatype" or "extension" or "ext" => "type",
+                _ => "name",
+            };
+        }
+
+        private static bool IsDescending(string? sortDirection)
+        {
+            return sortDirection?.Trim().Equals("desc", StringComparison.OrdinalIgnoreCase) == true
+                || sortDirection?.Trim().Equals("descending", StringComparison.OrdinalIgnoreCase) == true;
+        }
+
         /// <summary>
         /// 安全获取驱动器属性值，驱动器未就绪或访问异常时返回 null。
         /// </summary>
@@ -641,6 +731,7 @@ namespace FileShare_Services.Services.FileLibrary
                 file.Extension,
                 file.SizeBytes,
                 file.LastWriteTimeUtc,
+                file.FileCreationTimeUtc,
                 file.MediaType,
                 file.ContentType,
                 $"/api/files/{file.Id}/stream",