fix network interface information fetch from OS

backend/internal/system/handler.go

@@ -131,3 +131,45 @@ func (h *Handler) ListNetworkInterfaces(c *gin.Context) {
 
 	c.JSON(http.StatusOK, gin.H{"interfaces": interfaces})
 }
+
+// SaveNTPSettings saves NTP configuration to the OS
+func (h *Handler) SaveNTPSettings(c *gin.Context) {
+	var settings NTPSettings
+	if err := c.ShouldBindJSON(&settings); err != nil {
+		h.logger.Error("Invalid request body", "error", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body"})
+		return
+	}
+
+	// Validate timezone
+	if settings.Timezone == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "timezone is required"})
+		return
+	}
+
+	// Validate NTP servers
+	if len(settings.NTPServers) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "at least one NTP server is required"})
+		return
+	}
+
+	if err := h.service.SaveNTPSettings(c.Request.Context(), settings); err != nil {
+		h.logger.Error("Failed to save NTP settings", "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "NTP settings saved successfully"})
+}
+
+// GetNTPSettings retrieves current NTP configuration
+func (h *Handler) GetNTPSettings(c *gin.Context) {
+	settings, err := h.service.GetNTPSettings(c.Request.Context())
+	if err != nil {
+		h.logger.Error("Failed to get NTP settings", "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to get NTP settings"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"settings": settings})
+}