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

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

internal/nodeclient/client.go

@@ -0,0 +1,44 @@
+package nodeclient
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/orohi/vpn-panel/internal/models"
+)
+
+type HealthResponse struct {
+	OK       bool     `json:"ok"`
+	Name     string   `json:"name"`
+	Version  string   `json:"version"`
+	Uptime   int64    `json:"uptime_sec"`
+	Protocols []string `json:"protocols"`
+}
+
+func Health(n *models.Node) (*HealthResponse, error) {
+	url := fmt.Sprintf("http://%s:%d/health", n.Host, n.NodePort)
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", "Bearer "+n.SecretKey)
+
+	client := &http.Client{Timeout: 8 * time.Second}
+	res, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+	body, _ := io.ReadAll(res.Body)
+	if res.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("status %d: %s", res.StatusCode, string(body))
+	}
+	var hr HealthResponse
+	if err := json.Unmarshal(body, &hr); err != nil {
+		return nil, err
+	}
+	return &hr, nil
+}