Implement session-based API endpoints for creating, managing, and interacting with pre-funded sessions, including deposit and top-up invoice generation, macaroon authentication, and per-request debiting of compute costs. Replit-Commit-Author: Agent Replit-Commit-Session-Id: 418bf6f8-212b-4bb0-a7a5-8231a061da4e Replit-Commit-Checkpoint-Type: full_checkpoint Replit-Commit-Event-Id: 2dc3847e-7186-4a22-9c7e-16cd31bca8d9 Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9f85e954-647c-46a5-90a7-396e495a805a/418bf6f8-212b-4bb0-a7a5-8231a061da4e/sPDHkg8 Replit-Helium-Checkpoint-Created: true