feat(apps): package podsteadr as a full Archipelago app (3-container manifest set)

Adds apps/podsteadr (main Fastify+Vue app, container.build from the podsteadr
repo), apps/podsteadr-mediamtx (RTMP/WHIP ingest, HLS, recording), and
apps/podsteadr-blossom (BUD-02 media blobs), wired together on a dedicated
podsteadr-net bridge network per the multi-container pattern documented in
docs/app-developer-guide.md (indeedhub's api/relay/minio/redis/postgres
siblings). All podsteadr ports are auth: none with a rationale, since it's a
public podcast/livestream server whose RSS feeds, HLS playback, and blob
reads must stay reachable by third-party clients with no Archipelago session
— the app already gates its own sensitive routes with NIP-98 and per-stream
secret keys.

Also updates apps/PORTS.md, apps/README.md, and bumps the reviewed
unauthenticated-port count in core/container/src/manifest.rs's
unauthenticated_ports_are_all_accounted_for test (25 -> 31) to acknowledge
the six new auth:none ports. Regenerated catalog-derived files
(core/archipelago/src/fips/app_ports.rs,
neode-ui/src/views/appSession/generatedAppSessionConfig.ts) via
scripts/generate-app-catalog.py.

All three manifests pass scripts/validate-app-manifest.sh and
`cargo test -p archipelago-container manifest`.

apps/PORTS.md

@@ -25,6 +25,7 @@ This document lists all port assignments for Archipelago apps.
 | did-wallet | 8083 | TCP | Web UI | 18083 |
 | router | 8084, 5353, 1900 | TCP/UDP | Web UI, mDNS, SSDP | 18084, 15353, 11900 |
 | meshtastic | 4403, 1883 | TCP | HTTP API, MQTT | 14403, 11883 |
+| podsteadr | 8095, 1935, 8889, 8189, 8890, 8098 | TCP/UDP | Web UI/API/RSS, RTMP ingest, WebRTC/WHIP ingest, WebRTC ICE (udp), HLS playback, Blossom blobs | 18095, 11935, 18889, 18189, 18890, 18098 |
 
 ## Development Ports (Offset: +10000)