Chore: regenerate docs navigation

Auto-generated-by: update-generated-files-action; https://github.com/OpenRouterTeam/python-sdk/actions/runs/35489946996

Author: github-actions[bot]

docs/docs.json

@@ -38,6 +38,7 @@
       "sdks/responses/README",
       "sdks/scim/README",
       "sdks/stt/README",
+      "sdks/systemone/README",
       "sdks/tts/README",
       "sdks/vault/README",
       "sdks/videogeneration/README",