New FPSL Loans Analytics endpoint

Broker API

Adds an endpoint to read fully paid securities lending (FPSL) loan analytics for an account.

• Accepts either a sub-account UUID or an OmniSub master account UUID in the path.
• Optional start (inclusive) and end (exclusive) query parameters scope the reporting window; both default to the current month-to-date in New York time.
• Returns lending activity counts and an interest breakdown.

Affected Endpoints

• GET /v1/fpsl/analytics/{account_id}/loans