feat: 视频缩略图生成、最近文件面板与前端视图重构

- 新增 VideoThumbnailService，基于 ffmpeg 截取视频缩略图，ffprobe 提取时长 - 新增 ManagedThumbnailMap 模型及多数据库迁移，存储缩略图元数据 - 新增 /api/thumbnails/{id} 缩略图流端点 - 新增最近添加/最近播放 API 与前端面板，支持列表/网格双视图切换 - FileRecordDto 扩展 thumbnailUrl、videoDuration、lastPlayedAt 字段 - 前端新增文件库 Tab 导航、卡片网格视图、视频海报与时长信息栏 - 添加文件库目录不再同步全量扫描，改为后台异步自动扫描
2026-05-22 17:01:49 +08:00
parent 6acc92ca27
commit 2c20f9bb54
47 changed files with 5975 additions and 64 deletions
@@ -0,0 +1,38 @@
+using FileShare_EFCore.Database;
+using FileShare_Services.Core;
+using Microsoft.EntityFrameworkCore;
+
+namespace FileShare_Services.Services.FileLibrary
+{
+    public interface IThumbnailStreamService
+    {
+        Task<FileStreamResponse?> GetThumbnailAsync(int id, CancellationToken cancellationToken = default);
+    }
+
+    public sealed class ThumbnailStreamService(AppDataContext db, IVideoThumbnailService thumbnails) : IThumbnailStreamService
+    {
+        public async Task<FileStreamResponse?> GetThumbnailAsync(int id, CancellationToken cancellationToken = default)
+        {
+            var thumbnail = await db.ManagedThumbnailMaps
+                .AsNoTracking()
+                .FirstOrDefaultAsync(item => item.Id == id, cancellationToken);
+
+            if (thumbnail is null)
+            {
+                return null;
+            }
+
+            var absolutePath = thumbnails.GetAbsolutePath(thumbnail.RelativePath);
+            if (!File.Exists(absolutePath))
+            {
+                return null;
+            }
+
+            return new FileStreamResponse(
+                absolutePath,
+                Path.GetFileName(absolutePath),
+                thumbnail.ContentType,
+                File.GetLastWriteTimeUtc(absolutePath));
+        }
+    }
+}