fix: add electrs-ui to ISO build and first-boot for flawless installs

- Add electrs-ui to ISO capture patterns (captured from live server)
- Bundle nginx:alpine base image in ISO for UI container builds
- Copy docker UI source files (bitcoin-ui, lnd-ui, electrs-ui) into ISO
- First-boot: create electrs-ui container from pre-built image or source
- First-boot: create bitcoin-ui and lnd-ui containers (same pattern)
- Installer: copy docker/ source dir to target for first-boot fallback
- Nginx: minor config sync from linter changes

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

scripts/first-boot-containers.sh

@@ -94,6 +94,24 @@ if ! $DOCKER ps --format '{{.Names}}' 2>/dev/null | grep -qE 'archy-mempool-web|
     docker.io/mempool/frontend:v2.5.0 2>>"$LOG" || true
 fi
 
+# 2b. Electrs UI (status dashboard on port 50002, host network for backend access)
+if ! $DOCKER ps --format '{{.Names}}' 2>/dev/null | grep -q electrs-ui; then
+  if $DOCKER images --format '{{.Repository}}:{{.Tag}}' 2>/dev/null | grep -q 'electrs-ui'; then
+    log "Starting Electrs UI from pre-built image..."
+    $DOCKER run -d --name archy-electrs-ui --network host --restart unless-stopped \
+      localhost/electrs-ui:latest 2>>"$LOG" || \
+    $DOCKER run -d --name archy-electrs-ui --network host --restart unless-stopped \
+      electrs-ui:latest 2>>"$LOG" || true
+  elif [ -d /opt/archipelago/docker/electrs-ui ]; then
+    log "Building and starting Electrs UI from source..."
+    $DOCKER build -t electrs-ui:latest /opt/archipelago/docker/electrs-ui 2>>"$LOG" && \
+    $DOCKER run -d --name archy-electrs-ui --network host --restart unless-stopped \
+      electrs-ui:latest 2>>"$LOG" || true
+  else
+    log "Electrs UI: no image or source found, skipping"
+  fi
+fi
+
 # 3. BTCPay stack (matches deploy)
 if ! $DOCKER ps -a --format '{{.Names}}' 2>/dev/null | grep -qE 'archy-btcpay-db|postgres-btcpay'; then
   log "Creating PostgreSQL for BTCPay..."
@@ -341,4 +359,27 @@ if $DOCKER images --format '{{.Repository}}:{{.Tag}}' 2>/dev/null | grep -q 'str
   fi
 fi
 
+# 9. Custom UI containers (bitcoin-ui, lnd-ui)
+# These are built from Dockerfiles in /opt/archipelago/docker/ or loaded from pre-built images.
+for ui in bitcoin-ui lnd-ui; do
+  if $DOCKER ps --format '{{.Names}}' 2>/dev/null | grep -q "$ui"; then
+    continue
+  fi
+  case $ui in
+    bitcoin-ui) PORT_ARG="-p 8334:80"; NET_ARG="" ;;
+    lnd-ui)     PORT_ARG="-p 8081:80"; NET_ARG="" ;;
+  esac
+  CONTAINER_NAME="archy-$ui"
+  if $DOCKER images --format '{{.Repository}}:{{.Tag}}' 2>/dev/null | grep -q "$ui"; then
+    log "Starting $ui from pre-built image..."
+    IMG=$($DOCKER images --format '{{.Repository}}:{{.Tag}}' 2>/dev/null | grep "$ui" | head -1)
+    $DOCKER run -d --name "$CONTAINER_NAME" $PORT_ARG --restart unless-stopped $NET_ARG "$IMG" 2>>"$LOG" || true
+  elif [ -d "/opt/archipelago/docker/$ui" ]; then
+    log "Building $ui from source..."
+    if $DOCKER build -t "$ui:latest" "/opt/archipelago/docker/$ui" 2>>"$LOG"; then
+      $DOCKER run -d --name "$CONTAINER_NAME" $PORT_ARG --restart unless-stopped $NET_ARG "$ui:latest" 2>>"$LOG" || true
+    fi
+  fi
+done
+
 log "First-boot container creation complete"