增加公告图片编辑, 增加取消归档

backend/internal/modules/file/storage_test.go

@@ -1,6 +1,9 @@
 package file
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func TestSanitizeObjectMetadataEscapesNonASCII(t *testing.T) {
 	got := sanitizeObjectMetadata(map[string]string{
@@ -11,3 +14,18 @@ func TestSanitizeObjectMetadataEscapesNonASCII(t *testing.T) {
 		t.Fatalf("metadata filename = %q", got["original-filename"])
 	}
 }
+
+func TestAnnouncementSceneUsesPublicFileURL(t *testing.T) {
+	key := "announcement/2026/06/15/example.webp"
+	got := fileURLForScene("announcement", key)
+
+	if !strings.HasPrefix(got, "/api/public/files/object?") {
+		t.Fatalf("announcement file url = %q, want public file endpoint", got)
+	}
+}
+
+func TestNormalizeSceneAllowsAnnouncement(t *testing.T) {
+	if got := normalizeScene("announcement"); got != "announcement" {
+		t.Fatalf("normalize announcement scene = %q", got)
+	}
+}