Update SBB direct download URL to 2026 version (#1162)

* update: SBB direct download URL; addresses issue #1161

* update: SBB direct download URL; addresses issue #1161

* update: name and official status

* chore: removed unnecessary file; address issue 1161

Author: ianktc

catalogs/sources/gtfs/schedule/ch-unknown-swiss-federal-railways-sbb-gtfs-2898.json

@@ -0,0 +1,23 @@
+{
+    "mdb_source_id": 2898,
+    "data_type": "gtfs",
+    "provider": "Swiss Federal Railways (SBB)",
+    "is_official": "True",
+    "name": "2026 Systemaufgaben Kundeninformation (SKI+)",
+    "location": {
+        "country_code": "CH",
+        "bounding_box": {
+            "minimum_latitude": null,
+            "maximum_latitude": null,
+            "minimum_longitude": null,
+            "maximum_longitude": null,
+            "extracted_on": "2025-11-26-T15:19:10+00:00"
+        }
+    },
+    "urls": {
+        "direct_download": "https://data.opentransportdata.swiss/dataset/timetable-2026-gtfs2020/permalink",
+        "authentication_type": 0,
+        "latest": "https://storage.googleapis.com/storage/v1/b/mdb-latest/o/ch-unknown-swiss-federal-railways-sbb-gtfs-2898.zip?alt=media",
+        "license": "https://opentransportdata.swiss/en/terms-of-use/#Definitions"
+    }
+}