Phase 3: CLI inbox command. Add appview_url + appview_token to CLI config. New commands/inbox.rs calls GET /api/inbox?did=<my_did>, displays grants in table format (similar to shared command). Wire into main.rs command dispatch.
Delivered by #7 (inbox CLI command).
Phase 3: CLI inbox command. Add appview_url + appview_token to CLI config. New commands/inbox.rs calls GET /api/inbox?did=<my_did>, displays grants in table format (similar to shared command). Wire into main.rs command dispatch.