fix: reduce emby load and stabilize strm scan

internal/handler/emby_test.go

@@ -276,6 +276,50 @@ func TestEmbyVirtualFoldersRouteReturnsJSON(t *testing.T) {
 	}
 }
 
+func TestEmbyItemsCountsRouteReturnsJSON(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if err := db.AutoMigrate(&model.User{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	repos := repository.New(db)
+	if err := repos.User.Create(t.Context(), &model.User{
+		Base:         model.Base{ID: "user-1"},
+		Username:     "tester",
+		PasswordHash: "x",
+		Role:         "admin",
+		Tier:         "plus",
+		IsActive:     true,
+	}); err != nil {
+		t.Fatalf("create user: %v", err)
+	}
+
+	const secret = "test-secret"
+	router := gin.New()
+	registerEmbyRoutes(router, secret, &service.Container{Repo: repos})
+
+	for _, path := range []string{"/Items/Counts", "/Users/user-1/Items/Counts", "/items/counts"} {
+		req := httptest.NewRequest(http.MethodGet, path, nil)
+		req.Header.Set("X-Emby-Token", signedTestToken(t, secret))
+		w := httptest.NewRecorder()
+		router.ServeHTTP(w, req)
+
+		if w.Code != http.StatusOK {
+			t.Fatalf("%s status=%d body=%s", path, w.Code, w.Body.String())
+		}
+		var body map[string]any
+		if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
+			t.Fatalf("%s decode response: %v", path, err)
+		}
+		if _, ok := body["MovieCount"]; !ok {
+			t.Fatalf("%s missing MovieCount: %#v", path, body)
+		}
+	}
+}
+
 func TestEmbyItemImageServesWithoutAPIAuth(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
@@ -531,6 +575,65 @@ func TestEmbyLowercaseVideoStreamRouteServesMedia(t *testing.T) {
 	}
 }
 
+func TestEmbyLowercaseOriginalHeadRouteServesHeaders(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if err := db.AutoMigrate(model.AllModels()...); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	repos := repository.New(db)
+	if err := repos.User.Create(t.Context(), &model.User{
+		Base:         model.Base{ID: "user-1"},
+		Username:     "tester",
+		PasswordHash: "x",
+		Role:         "admin",
+		Tier:         "plus",
+		IsActive:     true,
+	}); err != nil {
+		t.Fatalf("create user: %v", err)
+	}
+	dir := t.TempDir()
+	mediaPath := filepath.Join(dir, "sample.mp4")
+	if err := os.WriteFile(mediaPath, []byte("fake-video-bytes"), 0o644); err != nil {
+		t.Fatalf("write media: %v", err)
+	}
+	lib := model.Library{Name: "电影", Path: dir, Type: "movie", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatalf("create library: %v", err)
+	}
+	if err := db.Create(&model.Media{
+		Base:      model.Base{ID: "media-1"},
+		LibraryID: lib.ID,
+		Title:     "Lowercase Original",
+		Path:      mediaPath,
+		Container: "mp4",
+	}).Error; err != nil {
+		t.Fatalf("create media: %v", err)
+	}
+
+	const secret = "test-secret"
+	router := gin.New()
+	registerEmbyRoutes(router, secret, &service.Container{
+		Repo:   repos,
+		Emby:   service.NewEmbyService(&config.Config{}, zap.NewNop(), repos),
+		Stream: service.NewStreamService(&config.Config{}, zap.NewNop(), repos, nil),
+	})
+
+	req := httptest.NewRequest(http.MethodHead, "/videos/media-1/original.mp4?api_key="+signedTestToken(t, secret), nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("unexpected status: %d body=%s", w.Code, w.Body.String())
+	}
+	if w.Body.Len() != 0 {
+		t.Fatalf("HEAD response should not include body, got %q", w.Body.String())
+	}
+}
+
 func TestEmbyLowercaseVideoHLSRouteDoesNot404WhenDirectOnly(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})