Add Help Command to Agent WDD CLI

- Implemented a new 'help' command in the root command
- Configured the help command to use the default usage template
- Integrated the help command into the root command's available subcommands

agent-wdd/cmd/root.go

@@ -111,6 +111,18 @@ func Execute() {
 	}
 	addDownloadSubcommands(downloadCmd)
 
+	helpCmd := &cobra.Command{
+		Use:   "help",
+		Short: "帮助信息",
+		Run: func(cmd *cobra.Command, args []string) {
+			// 在你的命令执行函数中
+			cmd.Root().SetHelpFunc(func(c *cobra.Command, s []string) {
+				// 直接使用默认帮助模板
+				c.Usage()
+			})
+		},
+	}
+
 	// 添加所有根命令
 	rootCmd.AddCommand(
 		baseCmd,
@@ -123,6 +135,7 @@ func Execute() {
 		versionCmd,
 		configCmd,
 		downloadCmd,
+		helpCmd,
 	)
 
 	if err := rootCmd.Execute(); err != nil {