fix: 兼容历史收藏源避免列表崩溃

server/im_http_test.go

@@ -4964,6 +4964,41 @@ func TestServeIMFavoritesListSupportsRefOnlyAttachment(t *testing.T) {
 	}
 }
 
+func TestServeIMFavoritesListKeepsLegacySeedSnapshots(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	expectIMBearer(t, ctrl, "token-1", 7, 42)
+	oldFavorites := store.Favorites
+	oldSubs := store.Subs
+	oldMessages := store.Messages
+	now := time.Date(2026, 9, 9, 9, 0, 0, 0, time.UTC)
+	store.Favorites = &testFavoritesStore{items: []types.FavoriteItem{{
+		TenantID: 7, FavoriteID: "fav_seed_19179719768_text", UserID: 42, ItemType: "text",
+		SourceTopic: "favSeed19179719768", SourceSeq: 7001, Availability: "available", CollectedAt: now,
+		Snapshot: map[string]any{"text": "seed favorite"},
+	}}}
+	store.Subs = mock_store.NewMockSubsPersistenceInterface(ctrl)
+	store.Messages = nil
+	defer func() {
+		store.Favorites = oldFavorites
+		store.Subs = oldSubs
+		store.Messages = oldMessages
+	}()
+
+	req := httptest.NewRequest(http.MethodGet, "/v1/im/favorites?type=all", nil)
+	req.Header.Set("Authorization", "Bearer token-1")
+	rec := httptest.NewRecorder()
+	serveIMFavorites(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body=%s", rec.Code, http.StatusOK, rec.Body.String())
+	}
+	data := decodeIMHTTPResponse(t, rec).Data.(map[string]any)
+	items := data["items"].([]any)
+	if len(items) != 1 || items[0].(map[string]any)["favorite_id"] != "fav_seed_19179719768_text" {
+		t.Fatalf("unexpected legacy seed favorite response: %#v", data)
+	}
+}
+
 func TestNormalizeIMUserVisibleTopicSelf(t *testing.T) {
 	uid := types.Uid(42)
 	got, ok := normalizeIMUserVisibleTopic(uid, "slf")