my-sea voice Phase C: WebRTC mesh signaling app + TURN endpoint + voice-btn wiring + coturn infra — TDD

Phase C (final) of the my-sea invite → spectator → voice blueprint. Self-
hosted WebRTC mesh voice, built room-general but wired for my-sea only; epic
6-seat rooms reuse the same consumer later (key on Room.id). Media never
touches the server — only signaling is relayed. Built from the blueprint's
distilled spec (disco-voice-mesh.pdf unreadable in-env: no poppler/pypdf).

- C1: new apps/voice/ — RoomVoiceConsumer (AsyncJsonWebsocketConsumer):
  signaling-only relay (room group voice.<room_id> + per-peer peer.<uuid>;
  hello→present handshake, offer/answer/ice routed by target/source, left on
  disconnect). room_id is a STRING kwarg (mysea-<owner_id> now). _can_join
  gates: mysea → owner OR present invitee (token deposited, not left); epic
  UUID → seated gamer (later). routing.py ws/voice/<str:room_id>/; asgi.py
  aggregates epic + voice urlpatterns under AuthMiddlewareStack.
  voice-mesh.js: VoiceRoom client (getUserMedia AEC/NS/AGC, mesh
  RTCPeerConnection, newcomer-offers handshake, tuneOpus SDP munge =
  inbandfec+dtx+40kbps cap, mute via getAudioTracks().enabled), lazy-loaded.
- C2: apps/api VoiceTURNCredentialsAPI at /api/voice/turn-credentials/ —
  coturn use-auth-secret REST scheme: username=<expiry>:<user_id>,
  credential=base64(HMAC-SHA1(username, COTURN_SHARED_SECRET)) + stun/turn
  iceServers + ttl. Authenticated-only. 4 ITs (HMAC shape, auth gate).
- C3: settings COTURN_SHARED_SECRET / COTURN_TURN_HOST / COTURN_REALM /
  COTURN_TTL env block.
- C4: #id_voice_btn wiring — _burger.html renders .active + data-room-id when
  voice_active; burger-btn.js bindVoiceBtn (active click → lazy-load
  voice-mesh.js → join / toggle-mute; inactive → existing 2-pulse flash).
  my_sea (owner) + my_sea_visit (spectator) views compute voice_active
  (open 24h window) + voice_room_id=mysea-<owner_id>; spectator page now
  includes the burger. 4 voice-context ITs.
- C5: infra/coturn.conf.j2 (use-auth-secret, the external-ip footgun, relay
  port range, TLS 5349, peer-IP lockdown) + infra/coturn-playbook.yaml
  (dedicated droplet, PySwiss-style split: install coturn, template conf, ufw
  3478/5349/49152-65535, systemd enable) + [coturn] inventory placeholder.
  *** Manual ops step: provision the droplet + fill inventory before voice
  works on staging/prod; CI/local need none of it. ***
- C6: 8 channels ITs (@tag channels) — connect/auth/_can_join gate (owner,
  present invitee, stranger, not-present, anon) + hello/present handshake +
  offer routing + left-on-disconnect. Scope-injected; TransactionTestCase.
- JS: VoiceMeshSpec.js (tuneOpus) + voice-mesh.js registered in SpecRunner.

1440 IT/UT green; voice channels IT + full Jasmine + voice-btn FT green.
Voice infra is code-complete — provision the coturn droplet to go live.

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Opus 4.7 (1M context) <noreply@anthropic.com>

infra/coturn.conf.j2

@@ -0,0 +1,49 @@
+# coturn (TURN/STUN) config for the EarthmanRPG WebRTC mesh voice feature —
+# Phase C of the my-sea invite/voice sprint. Rendered by coturn-playbook.yaml
+# onto a DEDICATED droplet (PySwiss-style split), NOT the app droplet.
+#
+# The app's /api/voice/turn-credentials/ endpoint signs ephemeral credentials
+# with HMAC-SHA1(<expiry>:<user_id>, secret); `use-auth-secret` +
+# `static-auth-secret` here must use the SAME secret (COTURN_SHARED_SECRET in
+# the app env).
+
+listening-port=3478
+tls-listening-port=5349
+
+fingerprint
+lt-cred-mech
+use-auth-secret
+static-auth-secret={{ coturn_secret }}
+realm={{ coturn_realm }}
+
+# ── THE #1 FOOTGUN ──────────────────────────────────────────────────────────
+# Without external-ip, coturn hands out its PRIVATE address as the relay
+# candidate and every relayed connection silently fails. On a DigitalOcean
+# droplet with a single public IP set it to that IP; if the droplet also has a
+# private/anchor IP, use PUBLIC/PRIVATE so coturn maps between them.
+external-ip={{ coturn_public_ip }}{% if coturn_private_ip is defined and coturn_private_ip %}/{{ coturn_private_ip }}{% endif %}
+
+# Relay port range — open this exact UDP range in the firewall (playbook does).
+min-port=49152
+max-port=65535
+
+# ── TLS (turns: on 5349) — prod hardening ──────────────────────────────────
+{% if coturn_tls_cert is defined and coturn_tls_cert %}
+cert={{ coturn_tls_cert }}
+pkey={{ coturn_tls_key }}
+{% endif %}
+no-tlsv1
+no-tlsv1_1
+
+# ── Lockdown: relay only, no SSRF via the TURN server ───────────────────────
+no-multicast-peers
+no-cli
+no-software-attribute
+# Block relaying to private ranges so the box can't be used to probe internals.
+denied-peer-ip=10.0.0.0-10.255.255.255
+denied-peer-ip=172.16.0.0-172.31.255.255
+denied-peer-ip=192.168.0.0-192.168.255.255
+denied-peer-ip=127.0.0.0-127.255.255.255
+
+log-file=/var/log/turnserver/turn.log
+simple-log