feat: track authorized (authenticated + successful) requests

Add 'authorized' status for requests that complete successfully after
authentication. This complements the existing 'unauthenticated' (pre-auth)
status tracking.

Now the dashboard shows:
- Authorized: Authenticated requests that succeeded
- Unauthorized: Authenticated requests rejected (not in allowlist)
- Pre-Auth: Requests sent before authentication

This gives full visibility into the auth flow:
1. Challenges: How many clients authenticated
2. Authorized: How many authenticated requests succeeded
3. Unauthorized: How many were rejected despite valid auth
4. Pre-Auth: How many tried before authenticating

Updated metrics:
- requests_total{status="authorized"} - authenticated successes
- requests_total{status="ok"} - unauthenticated successes (when no auth)

0 files changed, 0 insertions, 0 deletions