List Complete/total session quotas for known services in an environment.

Query:

• environment (required): environment name (e.g., production)
• service_name (optional, repeatable): restrict to those service names

Limits:

• Response includes at most 1000 services. Unfiltered lists larger than that return 400; narrow with service_name.

Response:
Each row is a known service in the environment. null / null means no explicit service-env session quota (tier / default new-service behavior may still apply). Tag throttle is not exposed.

Auth: requires throttling:read (operator keys). Reader/v1 keys receive 403.

Example:
GET /throttling/session-quotas?environment=production&service_name=checkout-api