Add node mode with SSH auto-install and Remnawave-style manual deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/nodeinstall/compose.go

@@ -0,0 +1,49 @@
+package nodeinstall
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/orohi/vpn-panel/internal/models"
+)
+
+const AgentVersion = "0.1.0"
+
+func ComposeYAML(n *models.Node) string {
+	return fmt.Sprintf(`services:
+  vpn-node:
+    container_name: vpn-panel-node
+    image: alpine:3.21
+    restart: unless-stopped
+    network_mode: host
+    environment:
+      NODE_NAME: %q
+      NODE_PORT: %q
+      SECRET_KEY: %q
+      AGENT_VERSION: %q
+    volumes:
+      - ./vpn-node:/usr/local/bin/vpn-node:ro
+      - ./data:/var/lib/vpn-node
+    command: ["/usr/local/bin/vpn-node"]
+`, n.Name, fmt.Sprintf("%d", n.NodePort), n.SecretKey, AgentVersion)
+}
+
+func ManualInstallScript(n *models.Node) string {
+	compose := ComposeYAML(n)
+	var b strings.Builder
+	b.WriteString("#!/usr/bin/env bash\n")
+	b.WriteString("set -euo pipefail\n\n")
+	b.WriteString("sudo curl -fsSL https://get.docker.com | sh\n")
+	b.WriteString("sudo mkdir -p /opt/vpn-panel-node/data\n")
+	b.WriteString("cd /opt/vpn-panel-node\n\n")
+	b.WriteString("cat > docker-compose.yml <<'EOF'\n")
+	b.WriteString(compose)
+	b.WriteString("EOF\n\n")
+	b.WriteString("# Скопируйте бинарник vpn-node (linux amd64) в /opt/vpn-panel-node/vpn-node\n")
+	b.WriteString("# chmod +x /opt/vpn-panel-node/vpn-node\n")
+	b.WriteString("# docker compose up -d && docker compose logs -f -t\n")
+	b.WriteString("\necho \"NODE_PORT=")
+	b.WriteString(fmt.Sprintf("%d", n.NodePort))
+	b.WriteString(" — откройте его только для IP панели\"\n")
+	return b.String()
+}