[TOL-2484] Add whoami to cli

[delwaterman]

• Update auth status to use /whoami route on auth server

❯ go run --tags=dev ./cmd/tollbit auth status
Agent:          anonymous
User agent:
Token:          valid (expires 2026-08-20T14:55:10Z)
On behalf:
  User:         [REDACTED]@tollbit.com
  Organization:  [REDACTED] test org
  Source:       consent
  User ID:      ky6peaw9fdzipil6uspecvqu
  Org ID:       so_ecy0h7nn7m2zc35m83ufqf4x
Auto-refresh:   enabled
Refresh:        present (expires 2026-09-19T13:55:10.994424171Z)

❯ go run --tags=dev ./cmd/tollbit auth status --json
{
  "auto_refresh": true,
  "identity": {
    "name": "anonymous",
    "user_agent": ""
  },
  "pending_authorization": {
    "pending": false
  },
  "refresh_token": {
    "present": true,
    "expires_at": "2026-09-19T13:55:10.994424171Z"
  },
  "token": {
    "configured": true,
    "valid": true,
    "subject": "anonymous",
    "expires_at": "2026-08-20T14:55:10Z",
    "obo": {
      "source": "consent",
      "user": "ky6peaw9fdzipil6uspecvqu",
      "org": "so_ecy0h7nn7m2zc35m83ufqf4x",
      "primary_email": " [REDACTED]@tollbit.com",
      "organization_name": "[REDACTED] test org"
    }
  }
}