feat(apps): package Cuprate, an alternative Monero node

Full-node daemon: P2P + Monero's own restricted RPC (the safe-for-public
subset wallets use as a "remote node") are auth:none like bitcoin/electrumx's
equivalents; unrestricted RPC (full node control) stays gated auth:local.
readonly_root works cleanly since the upstream image is FROM scratch with
ownership fixed at build time — no runtime chown/setuid needed, unlike
bitcoin-knots/core.

Verified locally end-to-end before committing: built the upstream Dockerfile,
confirmed the generated Cuprated.toml against `cuprated --generate-config`/
`--dry-run`, and ran the real image with the manifest's exact ports/volumes —
including discovering that cuprated's own 127.0.0.1-default RPC bind is
unreachable through a published host port and needs to bind 0.0.0.0
internally with ports[].bind:127.0.0.1 doing the actual restriction, the
same pattern bitcoin-knots' RPC port already uses in this repo.

Bumps the unauthenticated_ports_are_all_accounted_for canary (26 -> 28) for
cuprate's two auth:none ports, per that test's own review-before-updating
contract.

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

core/container/src/manifest.rs

@@ -1746,6 +1746,14 @@ app:
             }
         }
         exempt.sort();
+        // 28 as of 2026-08-21: the 26 below plus cuprate's two exemptions —
+        // 18183 (Monero p2p gossip, same reasoning as bitcoin's 8333) and
+        // 18089 (Monero restricted RPC, upstream's own safe-for-public
+        // subset that wallets connect to directly as a "remote node" over
+        // plain HTTP JSON-RPC — same reasoning as electrumx's 50001).
+        // cuprate's unrestricted RPC (full node control) stays loopback-only
+        // (auth: local), not in this set.
+        //
         // 26 as of 2026-08-16: the 25 below plus phoenixd 9740, a
         // loopback-only JSON API whose own generated http password
         // authenticates every request (added with the phoenixd onboarding,
@@ -1762,7 +1770,7 @@ app:
         // stage timed out that cycle, so the count here lagged at 17.
         assert_eq!(
             exempt.len(),
-            26,
+            28,
             "unauthenticated port set changed — review before updating this count: {exempt:?}"
         );
     }