Rename proboctl CLI binary to prb

Shorter CLI name for faster typing. Renames the binary, build targets,
goreleaser config, command examples, and documentation.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/cmd/auth/status/status.go

@@ -27,7 +27,7 @@ func NewCmdStatus(f *cmdutil.Factory) *cobra.Command {
 		Use:   "status",
 		Short: "View authentication status",
 		Example: `  # Show all configured hosts and their authentication status
-  proboctl auth status`,
+  prb auth status`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			cfg, err := f.Config()
 			if err != nil {