feat: instant companion pairing — device tokens, named QR, FIPS pair-info

- auth.createDeviceToken / listDeviceTokens / revokeDeviceToken RPCs; only
  SHA-256 hashes persist in data_dir/device-tokens.json
- auth.login accepts {token} (same rate limiter, skips TOTP like remember-me)
- pairing QR now carries name (server name, fallback "My Archipelago"),
  tok (instant login), and FIPS mesh params from new fips.pair-info RPC
  (npub, fips0 ULA, transport ports)
- companion onboarding drops the WireGuard install/tunnel screens — remote
  access moves to the FIPS mesh embedded in the companion app
- fix: fips daemon UDP bind now 2121, matching the published container port
  and fleet rosters (was upstream's 8668 — inbound UDP was dead on bridged
  installs, mesh silently rode TCP 8443)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/api/rpc/mod.rs

@@ -532,9 +532,18 @@ impl RpcHandler {
             self.login_rate_limiter.record_failure(client_ip).await;
         }
 
-        // On successful login, check if 2FA is required
+        // On successful login, check if 2FA is required. Device-token logins
+        // (companion pairing QR) skip the TOTP challenge like remember-me does:
+        // the token was minted from an already-authenticated session, and there
+        // is no password with which to decrypt the TOTP secret anyway.
         if method == "auth.login" && rpc_resp.error.is_none() {
-            let totp_enabled = self.auth_manager.is_totp_enabled().await.unwrap_or(false);
+            let is_token_login = login_params
+                .as_ref()
+                .and_then(|p| p.get("token"))
+                .and_then(|v| v.as_str())
+                .is_some();
+            let totp_enabled = !is_token_login
+                && self.auth_manager.is_totp_enabled().await.unwrap_or(false);
             if totp_enabled {
                 let password = login_params
                     .as_ref()