fix: align transport secret with cipher0 relay

Use cipher0's existing MESH_PEER_PUSH_SECRET so nodes connect
to the relay out of the box without configuration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/.env.example

@@ -47,7 +47,7 @@ AIS_API_KEY=              # https://aisstream.io/ — free tier WebSocket key
 # MESH_BOOTSTRAP_MANIFEST_PATH=data/bootstrap_peers.json
 # MESH_BOOTSTRAP_SIGNER_PUBLIC_KEY=
 # MESH_RELAY_PEERS=               # comma-separated operator-trusted sync/push peers
-# MESH_PEER_PUSH_SECRET=sb-public-testnet-v1-2026   # transport auth for mesh peer push (default works out of the box)
+# MESH_PEER_PUSH_SECRET=Mv63UvLfwqOEVWeRBXjA8MtFl2nEkkhUlLYVHiX1Zzo   # transport auth for mesh peer push (default works out of the box)
 # MESH_SYNC_INTERVAL_S=300
 # MESH_SYNC_FAILURE_BACKOFF_S=60
 #

backend/services/config.py

@@ -37,7 +37,7 @@ class Settings(BaseSettings):
     MESH_RELAY_PUSH_TIMEOUT_S: int = 10
     MESH_RELAY_MAX_FAILURES: int = 3
     MESH_RELAY_FAILURE_COOLDOWN_S: int = 120
-    MESH_PEER_PUSH_SECRET: str = "sb-public-testnet-v1-2026"
+    MESH_PEER_PUSH_SECRET: str = "Mv63UvLfwqOEVWeRBXjA8MtFl2nEkkhUlLYVHiX1Zzo"
     MESH_RNS_APP_NAME: str = "shadowbroker"
     MESH_RNS_ASPECT: str = "infonet"
     MESH_RNS_IDENTITY_PATH: str = ""

docker-compose.yml

@@ -16,7 +16,7 @@ services:
       # Default Infonet relay peer so fresh installs can sync immediately.
       - MESH_RELAY_PEERS=${MESH_RELAY_PEERS:-http://cipher0.shadowbroker.info:8000}
       # Shared transport auth for mesh peer push (default matches baked-in testnet secret).
-      - MESH_PEER_PUSH_SECRET=${MESH_PEER_PUSH_SECRET:-sb-public-testnet-v1-2026}
+      - MESH_PEER_PUSH_SECRET=${MESH_PEER_PUSH_SECRET:-Mv63UvLfwqOEVWeRBXjA8MtFl2nEkkhUlLYVHiX1Zzo}
     volumes:
       - backend_data:/app/data
     restart: unless-stopped