fix mostly bugs on system management, and user roles and group assignment

backend/internal/system/handler.go

@@ -173,3 +173,63 @@ func (h *Handler) GetNTPSettings(c *gin.Context) {
 
 	c.JSON(http.StatusOK, gin.H{"settings": settings})
 }
+
+// UpdateNetworkInterface updates a network interface configuration
+func (h *Handler) UpdateNetworkInterface(c *gin.Context) {
+	ifaceName := c.Param("name")
+	if ifaceName == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "interface name is required"})
+		return
+	}
+
+	var req struct {
+		IPAddress string `json:"ip_address" binding:"required"`
+		Subnet    string `json:"subnet" binding:"required"`
+		Gateway   string `json:"gateway,omitempty"`
+		DNS1      string `json:"dns1,omitempty"`
+		DNS2      string `json:"dns2,omitempty"`
+		Role      string `json:"role,omitempty"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		h.logger.Error("Invalid request body", "error", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body"})
+		return
+	}
+
+	// Convert to service request
+	serviceReq := UpdateNetworkInterfaceRequest{
+		IPAddress: req.IPAddress,
+		Subnet:    req.Subnet,
+		Gateway:   req.Gateway,
+		DNS1:      req.DNS1,
+		DNS2:      req.DNS2,
+		Role:      req.Role,
+	}
+
+	updatedIface, err := h.service.UpdateNetworkInterface(c.Request.Context(), ifaceName, serviceReq)
+	if err != nil {
+		h.logger.Error("Failed to update network interface", "interface", ifaceName, "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"interface": updatedIface})
+}
+
+// GetSystemLogs retrieves recent system logs
+func (h *Handler) GetSystemLogs(c *gin.Context) {
+	limitStr := c.DefaultQuery("limit", "30")
+	limit, err := strconv.Atoi(limitStr)
+	if err != nil || limit <= 0 || limit > 100 {
+		limit = 30
+	}
+
+	logs, err := h.service.GetSystemLogs(c.Request.Context(), limit)
+	if err != nil {
+		h.logger.Error("Failed to get system logs", "error", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to get system logs"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"logs": logs})
+}