Auto-detect Tailscale search domain during install

infmap/config/service.env

@@ -11,3 +11,6 @@ SSH_KEY_PATH=/root/.ssh/id_ed25519
 # Collection settings
 COLLECTION_INTERVAL=300
 MAX_CONCURRENT_SSH=5
+
+# Tailscale search domain (auto-detected during install if tailscale is available)
+# TAILNET_DOMAIN=

infmap/install.sh

@@ -14,6 +14,20 @@ _check_docker_installed || _die "Docker test failed"
 
 docker pull "$IMAGE_REGISTRY/$IMAGE_REPO:$IMAGE_TAG" || _die "Failed to pull image"
 
+# Auto-detect Tailscale search domain if not already configured
+if [ -z "${TAILNET_DOMAIN:-}" ] && command -v tailscale &>/dev/null; then
+    ts_domain=$(tailscale status --json 2>/dev/null | grep -oP '"MagicDNSSuffix":"\K[^"]+' || true)
+    if [ -n "$ts_domain" ]; then
+        export TAILNET_DOMAIN="$ts_domain"
+        echo "Auto-detected Tailscale domain: $ts_domain"
+        # Persist to service.env so it survives restarts
+        if ! grep -q '^TAILNET_DOMAIN=' "${SERVICE_ENV}" 2>/dev/null; then
+            echo "" >> "${SERVICE_ENV}"
+            echo "TAILNET_DOMAIN=$ts_domain" >> "${SERVICE_ENV}"
+        fi
+    fi
+fi
+
 # Create data volume
 docker volume create "${DATA_VOLUME}" 2>/dev/null || true