fix: align scraped media naming and release sorting

internal/repository/media_repository.go

@@ -103,12 +103,13 @@ func (r *MediaRepository) ListByLibrariesFiltered(ctx context.Context, libraryID
 		return nil, 0, err
 	}
 	// 多级排序消除"随机"观感:
-	//  1. year desc        — 上映年份新→旧(用户期望的上映时间维度)
-	//  2. updated_at desc  — 同年按最近更新(刮削/补集会刷新)
-	//  3. created_at desc  — 再按入库时间
-	//  4. id desc          — 稳定 tie-breaker:云盘批量扫描同批 created_at 相同时,
+	//  1. release_date desc — 精确上映/首播日期新→旧
+	//  2. year desc         — 老数据没有完整日期时仍按年份新→旧
+	//  3. updated_at desc   — 同日期/同年按最近更新兜底
+	//  4. created_at desc   — 再按入库时间
+	//  5. id desc           — 稳定 tie-breaker:云盘批量扫描同批 created_at 相同时,
 	//                        没有它 DB 返回顺序不确定,正是"随机排序"的根因。
-	err := q.Order("year DESC, updated_at DESC, created_at DESC, id DESC").
+	err := q.Order("release_date DESC, year DESC, updated_at DESC, created_at DESC, id DESC").
 		Offset(offset).Limit(limit).Find(&items).Error
 	return items, total, err
 }

internal/repository/media_repository_upsert.go

@@ -103,6 +103,9 @@ func addMediaTitleUpdates(updates map[string]any, existing, incoming model.Media
 			if incoming.Year > 0 {
 				setIfChanged(updates, "year", existing.Year, incoming.Year)
 			}
+			if incoming.ReleaseDate != "" {
+				setIfChanged(updates, "release_date", existing.ReleaseDate, incoming.ReleaseDate)
+			}
 			if strings.TrimSpace(existing.ScrapeStatus) == "no_match" && incoming.ScrapeStatus != "matched" && (titleChanged || yearChanged) {
 				updates["scrape_status"] = "pending"
 			}
@@ -119,6 +122,9 @@ func addMediaExternalIDUpdates(updates map[string]any, existing, incoming model.
 	if incoming.Year > 0 && existing.Year <= 0 {
 		updates["year"] = incoming.Year
 	}
+	if incoming.ReleaseDate != "" && existing.ReleaseDate == "" {
+		updates["release_date"] = incoming.ReleaseDate
+	}
 	if changedExternalID && (status == "no_match" || status == "matched") && incoming.ScrapeStatus != "matched" {
 		updates["scrape_status"] = "pending"
 	}
@@ -152,6 +158,9 @@ func addMatchedMediaDetailUpdates(updates map[string]any, existing, incoming mod
 	if incoming.Year > 0 {
 		setIfChanged(updates, "year", existing.Year, incoming.Year)
 	}
+	if incoming.ReleaseDate != "" {
+		setIfChanged(updates, "release_date", existing.ReleaseDate, incoming.ReleaseDate)
+	}
 	if incoming.NSFW && !existing.NSFW {
 		updates["nsfw"] = true
 	}

internal/repository/repository_test.go

@@ -186,6 +186,42 @@ func TestMediaUpsertMatchedIncomingRefreshesScrapedMetadata(t *testing.T) {
 	}
 }
 
+func TestListByLibraryOrdersByReleaseDate(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := database.AutoMigrate(db); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	repos := New(db)
+	lib := model.Library{Name: "国产剧", Path: "/media/tv", Type: "tv", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatal(err)
+	}
+	rows := []model.Media{
+		{LibraryID: lib.ID, Title: "旧片但最近更新", Path: "/media/tv/old.mkv", Year: 2026, ReleaseDate: "2026-01-10", ScrapeStatus: "matched"},
+		{LibraryID: lib.ID, Title: "最新首播", Path: "/media/tv/newest.mkv", Year: 2026, ReleaseDate: "2026-06-23", ScrapeStatus: "matched"},
+		{LibraryID: lib.ID, Title: "无完整日期", Path: "/media/tv/year-only.mkv", Year: 2025, ScrapeStatus: "matched"},
+	}
+	for i := range rows {
+		if err := repos.Media.Upsert(t.Context(), &rows[i]); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	items, total, err := repos.Media.ListByLibrary(t.Context(), lib.ID, 0, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if total != 3 || len(items) != 3 {
+		t.Fatalf("list total=%d len=%d", total, len(items))
+	}
+	if got := []string{items[0].Title, items[1].Title, items[2].Title}; got[0] != "最新首播" || got[1] != "旧片但最近更新" || got[2] != "无完整日期" {
+		t.Fatalf("release-date order = %#v", got)
+	}
+}
+
 func TestMediaUpsertScanDoesNotClearMatchedMetadata(t *testing.T) {
 	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
 	if err != nil {