fix: clap CLI definitions and manpage generation

- add #[group(skip)] to all Parser-derived structs
- fix conflicts_with and arg definitions for correct CLI behavior
- refactor bin entry points to support manpage generation

core/man/start-cli/start-cli-net-gateway-forget.1

@@ -0,0 +1,16 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH start-cli-net-gateway-forget 1  "forget " 
+.SH NAME
+start\-cli\-net\-gateway\-forget \- Forget a disconnected gateway
+.SH SYNOPSIS
+\fBstart\-cli net gateway forget\fR [\fB\-h\fR|\fB\-\-help\fR] <\fIGATEWAY\fR> 
+.SH DESCRIPTION
+Forget a disconnected gateway
+.SH OPTIONS
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help
+.TP
+<\fIGATEWAY\fR>
+Gateway identifier