feat: v1.2.0-alpha — E2E encrypted mesh relay, steganography, relay status polling

Phase 5 mesh networking:
- E2E encrypted TX relay (X25519 + ChaCha20-Poly1305) — non-Archy nodes
  relay encrypted blobs transparently via Meshcore native routing
- Steganographic encoding modes (WeatherStation, SensorNetwork) — traffic
  looks like sensor data on the wire, 0xAA marker, configurable per-node
- Pre-flight Bitcoin Core health check on relay node — specific error codes
  (bitcoin_unreachable, bitcoin_syncing, tx_rejected) instead of generic fails
- mesh.relay-status RPC endpoint — frontend polls for relay result every 3s
- On-Chain / Lightning tabs in Off-Grid Bitcoin panel
- Archy Peers vs Mesh Broadcast relay mode selector
- Mesh view fills viewport (no page scroll), internal panel scrolling
- Version bump to 1.2.0-alpha

Also includes: deploy hardening, container fixes, IndeedHub updates,
boot screen, dashboard improvements, MASTER_PLAN task tracking

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/first-boot-containers.sh

@@ -670,4 +670,13 @@ for c in bitcoin-knots lnd btcpay-server fedimint homeassistant grafana uptime-k
 done
 log "Post-boot validation: $RUNNING/$TOTAL core containers running"
 
+# 12. Run container doctor for any remaining issues
+log "Running container doctor..."
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+if [ -x "$SCRIPT_DIR/container-doctor.sh" ]; then
+    bash "$SCRIPT_DIR/container-doctor.sh" --local 2>&1 | tee -a "$LOG"
+elif [ -x "/opt/archipelago/scripts/container-doctor.sh" ]; then
+    bash "/opt/archipelago/scripts/container-doctor.sh" --local 2>&1 | tee -a "$LOG"
+fi
+
 log "First-boot container creation complete"