Add VPN client users with inbound access and subscription links.

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

internal/models/models.go

@@ -154,4 +154,74 @@ type DashboardStats struct {
 	NodesTotal       int
 	NodesOnline      int
 	ProfilesTotal    int
+	ClientsTotal     int
+	ClientsActive    int
+}
+
+type ClientStatus string
+
+const (
+	ClientStatusActive   ClientStatus = "active"
+	ClientStatusDisabled ClientStatus = "disabled"
+	ClientStatusExpired  ClientStatus = "expired"
+)
+
+type Client struct {
+	ID               uuid.UUID    `json:"id"`
+	Username         string       `json:"username"`
+	Email            string       `json:"email"`
+	UUID             uuid.UUID    `json:"uuid"` // VLESS/VMess user id
+	Status           ClientStatus `json:"status"`
+	TrafficLimitBytes int64       `json:"traffic_limit_bytes"` // 0 = unlimited
+	TrafficUsedBytes  int64       `json:"traffic_used_bytes"`
+	ExpireAt         *time.Time   `json:"expire_at,omitempty"`
+	SubToken         string       `json:"sub_token"`
+	Note             string       `json:"note"`
+	CreatedAt        time.Time    `json:"created_at"`
+	UpdatedAt        time.Time    `json:"updated_at"`
+
+	InboundIDs   []uuid.UUID `json:"inbound_ids,omitempty"`
+	InboundCount int         `json:"inbound_count"`
+}
+
+func (c Client) StatusLabel() string {
+	switch c.Status {
+	case ClientStatusActive:
+		return "Активен"
+	case ClientStatusDisabled:
+		return "Отключён"
+	case ClientStatusExpired:
+		return "Истёк"
+	default:
+		return string(c.Status)
+	}
+}
+
+func (c Client) IsActive() bool {
+	if c.Status != ClientStatusActive {
+		return false
+	}
+	if c.ExpireAt != nil && time.Now().After(*c.ExpireAt) {
+		return false
+	}
+	if c.TrafficLimitBytes > 0 && c.TrafficUsedBytes >= c.TrafficLimitBytes {
+		return false
+	}
+	return true
+}
+
+func (c Client) TrafficLimitGB() float64 {
+	if c.TrafficLimitBytes <= 0 {
+		return 0
+	}
+	return float64(c.TrafficLimitBytes) / (1024 * 1024 * 1024)
+}
+
+func (c Client) HasInbound(id uuid.UUID) bool {
+	for _, x := range c.InboundIDs {
+		if x == id {
+			return true
+		}
+	}
+	return false
 }