Point C++ API docs to NVIDIA Sphinx sites (#835)

## Summary

Route the libcudf, libkvikio, and librapidsmpf API cards from old Doxygen sites to the new Sphinx C++ documentation on docs.nvidia.com beginning with release 26.10. Older releases continue to use their existing docs.rapids.ai links, and migrated builds are no longer imported into the portal.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Naty Clementi (https://github.com/ncclementi)

URL: #835

Author: bdice

_data/docs.yml

@@ -191,7 +191,8 @@ libs:
   libcudf:
     name: libcudf
     path: libcudf
-    first_docs_nvidia_com_release: null
+    first_docs_nvidia_com_release: "26.10"
+    docs_nvidia_com_path: cudf/{version}/libcudf
     desc: 'libcudf is a C/C++ CUDA library for implementing standard dataframe operations.'
     ghlink: https://github.com/rapidsai/cudf
     cllink: https://github.com/rapidsai/cudf/blob/main/CHANGELOG.md
@@ -215,7 +216,8 @@ libs:
   libkvikio:
     name: libkvikio
     path: libkvikio
-    first_docs_nvidia_com_release: null
+    first_docs_nvidia_com_release: "26.10"
+    docs_nvidia_com_path: kvikio/{version}/cpp
     desc: "libkvikio is a C++ header-only library providing bindings to cuFile, which enables GPUDirect Storage (GDS)."
     ghlink: https://github.com/rapidsai/kvikio
     cllink: https://github.com/rapidsai/kvikio/blob/main/CHANGELOG.md
@@ -227,7 +229,8 @@ libs:
   librapidsmpf:
     name: librapidsmpf
     path: librapidsmpf
-    first_docs_nvidia_com_release: null
+    first_docs_nvidia_com_release: "26.10"
+    docs_nvidia_com_path: rapidsmpf/{version}/cpp
     desc: "librapidsmpf is a C++ collection of multi-GPU, distributed memory algorithms."
     ghlink: https://github.com/rapidsai/rapidsmpf
     versions:

ci/customization/projects-to-versions.json

@@ -48,8 +48,7 @@
   },
   "libcudf": {
     "legacy": "26.06",
-    "stable": "26.08",
-    "nightly": "26.10"
+    "stable": "26.08"
   },
   "libcuml": {
     "legacy": "26.06",
@@ -58,13 +57,11 @@
   },
   "libkvikio": {
     "legacy": "26.06",
-    "stable": "26.08",
-    "nightly": "26.10"
+    "stable": "26.08"
   },
   "librapidsmpf": {
     "legacy": "26.06",
-    "stable": "26.08",
-    "nightly": "26.10"
+    "stable": "26.08"
   },
   "libucxx": {
     "legacy": "0.50",

extensions/rapids_docs/routes.py

@@ -34,7 +34,8 @@ def _documentation_url(
     first_nvidia_release = project["first_docs_nvidia_com_release"]
     if first_nvidia_release and _version_tuple(version) >= _version_tuple(first_nvidia_release):
         target_version = "latest" if version_name == "nightly" else version
-        base_url = f"https://docs.nvidia.com/{project['path']}/{target_version}/"
+        path = project.get("docs_nvidia_com_path", f"{project['path']}/{{version}}")
+        base_url = f"https://docs.nvidia.com/{path.format(version=target_version)}/"
     else:
         base_url = f"https://docs.rapids.ai/api/{project['path']}/{version_name}/"
     return _with_suffix(base_url, suffix)

tests/test_rendering.py

@@ -54,6 +54,19 @@ def test_api_docs() -> None:
 
     libs = api._api_docs(data, "libs")
     assert "https://docs.nvidia.com/rapids-cmake/latest/" in libs
+    assert "https://docs.nvidia.com/cudf/latest/libcudf/" in libs
+    assert "https://docs.nvidia.com/kvikio/latest/cpp/" in libs
+    assert "https://docs.nvidia.com/rapidsmpf/latest/cpp/" in libs
+    if tuple(map(int, stable_version.split("."))) <= (26, 8):
+        assert f"[{stable_version}](https://docs.rapids.ai/api/libcudf/stable/)" in libs
+        assert f"[{stable_version}](https://docs.rapids.ai/api/libkvikio/stable/)" in libs
+        assert f"[{stable_version}](https://docs.rapids.ai/api/librapidsmpf/stable/)" in libs
+    else:
+        assert f"[{stable_version}](https://docs.nvidia.com/cudf/{stable_version}/libcudf/)" in libs
+        assert f"[{stable_version}](https://docs.nvidia.com/kvikio/{stable_version}/cpp/)" in libs
+        assert (
+            f"[{stable_version}](https://docs.nvidia.com/rapidsmpf/{stable_version}/cpp/)" in libs
+        )
     assert f"/{nightly_version}/" not in rendered + libs
 
     inactive = api._api_docs(data, "inactive-projects")