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

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

internal/models/models.go

@@ -27,8 +27,55 @@ type Protocol struct {
 	UpdatedAt   time.Time `json:"updated_at"`
 }
 
+type NodeStatus string
+
+const (
+	NodeStatusPending    NodeStatus = "pending"
+	NodeStatusInstalling NodeStatus = "installing"
+	NodeStatusOnline     NodeStatus = "online"
+	NodeStatusOffline    NodeStatus = "offline"
+	NodeStatusError      NodeStatus = "error"
+)
+
+type Node struct {
+	ID           uuid.UUID  `json:"id"`
+	Name         string     `json:"name"`
+	Host         string     `json:"host"`
+	SSHPort      int        `json:"ssh_port"`
+	SSHUser      string     `json:"ssh_user"`
+	SSHAuthType  string     `json:"ssh_auth_type"` // password | key
+	SSHSecretEnc string     `json:"-"`
+	NodePort     int        `json:"node_port"`
+	SecretKey    string     `json:"-"`
+	Status       NodeStatus `json:"status"`
+	InstallMode  string     `json:"install_mode"` // auto | manual
+	LastError    string     `json:"last_error"`
+	InstallLog   string     `json:"install_log"`
+	AgentVersion string     `json:"agent_version"`
+	LastSeenAt   *time.Time `json:"last_seen_at,omitempty"`
+	CreatedAt    time.Time  `json:"created_at"`
+	UpdatedAt    time.Time  `json:"updated_at"`
+}
+
+func (n Node) StatusLabel() string {
+	switch n.Status {
+	case NodeStatusOnline:
+		return "Online"
+	case NodeStatusInstalling:
+		return "Установка"
+	case NodeStatusOffline:
+		return "Offline"
+	case NodeStatusError:
+		return "Ошибка"
+	default:
+		return "Ожидание"
+	}
+}
+
 type DashboardStats struct {
 	ProtocolsTotal   int
 	ProtocolsEnabled int
 	AdminsTotal      int
+	NodesTotal       int
+	NodesOnline      int
 }