feat(nodes): add Dev channel option to node panel updates

The node update confirm dialog now offers a 'Dev channel (latest commit)' choice. The dev flag threads master -> nodes/updatePanel -> UpdatePanels -> remote.UpdatePanel -> the node's updatePanel endpoint, which calls StartUpdateChannel(dev) to install the rolling dev-latest build. With no dev flag the node keeps following its own channel setting.

internal/web/controller/node.go

@@ -318,6 +318,7 @@ func (a *NodeController) probe(c *gin.Context) {
 func (a *NodeController) updatePanel(c *gin.Context) {
 	var req struct {
 		Ids []int `json:"ids"`
+		Dev bool  `json:"dev"`
 	}
 	if err := c.ShouldBindJSON(&req); err != nil {
 		jsonMsg(c, I18nWeb(c, "somethingWentWrong"), err)
@@ -327,7 +328,7 @@ func (a *NodeController) updatePanel(c *gin.Context) {
 		jsonMsg(c, I18nWeb(c, "somethingWentWrong"), fmt.Errorf("no nodes selected"))
 		return
 	}
-	results, err := a.nodeService.UpdatePanels(req.Ids)
+	results, err := a.nodeService.UpdatePanels(req.Ids, req.Dev)
 	jsonMsgObj(c, I18nWeb(c, "pages.nodes.toasts.updateStarted"), results, err)
 }
 

internal/web/controller/server.go

@@ -206,9 +206,22 @@ func (a *ServerController) installXray(c *gin.Context) {
 	jsonMsg(c, I18nWeb(c, "pages.index.xraySwitchVersionPopover"), err)
 }
 
-// updatePanel starts a panel self-update to the latest release.
+// updatePanel starts a panel self-update. With no "dev" form value it follows
+// this panel's own channel setting; an explicit "dev" (sent by the master node
+// updater) overrides it for this run.
 func (a *ServerController) updatePanel(c *gin.Context) {
-	err := a.panelService.StartUpdate()
+	devParam := c.PostForm("dev")
+	var err error
+	if devParam == "" {
+		err = a.panelService.StartUpdate()
+	} else {
+		dev, perr := strconv.ParseBool(devParam)
+		if perr != nil {
+			jsonMsg(c, "invalid data", perr)
+			return
+		}
+		err = a.panelService.StartUpdateChannel(dev)
+	}
 	jsonMsg(c, I18nWeb(c, "pages.index.panelUpdateStartedPopover"), err)
 }