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Vertex AI GLM provider implementation (MaaS endpoint)
GLM-5 via Google Cloud Vertex AI Managed API Service. Uses service account JWT auth to obtain OAuth2 access tokens. The service account JSON key is stored in Vault and used to sign JWTs that are exchanged for short-lived access tokens (cached ~55 min).
Reference: https://console.cloud.google.com/vertex-ai/publishers/zai/model-garden/glm-5