feat(mesh): app direct ports reachable over the mesh — IPv4 listeners mirrored onto [::]

The companion reaches the node at its fips0 ULA, and the web UI builds app
links as http://[<ULA>]:<direct port> — but rootless-podman published ports
bind 0.0.0.0 only, so every app URL was refused over the mesh (:8334 first).
A reconcile loop in the backend mirrors public IPv4 listeners: any port
>=1024 on 0.0.0.0 without an IPv6 any-listener gets a v6-ONLY [::] forwarder
to 127.0.0.1, following /proc/net/tcp* so install/remove and hardcoded
companion ports are covered without touching a single container. Purely
additive: IPv4/LAN/Tor access paths are untouched, v6only listeners cannot
collide with or intercept v4 traffic, and foreign IPv6 listeners win.

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

core/archipelago/src/main.rs

@@ -34,6 +34,7 @@ mod bitcoin_rpc;
 mod bitcoin_status;
 mod blobs;
 mod bootstrap;
+mod mesh_ports;
 mod ceremony;
 mod config;
 mod constants;
@@ -395,6 +396,10 @@ async fn main() -> Result<()> {
     // iframe on kiosk nodes (docs/tv-input-iframe-apps.md).
     tokio::spawn(bootstrap::ensure_gamepad_keys());
 
+    // Mesh access: mirror IPv4-published app ports onto [::] so direct-port
+    // app URLs (http://[<fips0 ULA>]:<port>) work from the companion.
+    tokio::spawn(mesh_ports::run_mesh_port_mirror());
+
     // Pine voice: re-point IP-pinned Wyoming satellite entries (speakers) when
     // DHCP renumbering strands them — HA never re-resolves on its own.
     tokio::spawn(api::rpc::wyoming_satellite_keeper());