chore(api): sync OpenAPI contract

[kong]

Summary

• Sync the vendored OpenAPI contract from Kong/volcano-hosting@65b9a1e9b186.
• Regenerate checked-in client or contract types with this repository's pinned tooling.

API change report

Public API

New Endpoints: 4

---

GET /github/callback
POST /user/git/connect
GET /user/git/connections
DELETE /user/git/connections/{connectionId}

Deleted Endpoints: None

---

Modified Endpoints: None

---

Validation

• Contract generation completed in the source workflow run.
• Target repository CI validates the generated result.

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