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-tunnel-device-show-config.1

@@ -0,0 +1,22 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH start-cli-tunnel-device-show-config 1  "show-config " 
+.SH NAME
+start\-cli\-tunnel\-device\-show\-config \- Show WireGuard configuration for device
+.SH SYNOPSIS
+\fBstart\-cli tunnel device show\-config\fR [\fB\-h\fR|\fB\-\-help\fR] <\fISUBNET\fR> <\fIIP\fR> [\fIWAN_ADDR\fR] 
+.SH DESCRIPTION
+Show WireGuard configuration for device
+.SH OPTIONS
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help
+.TP
+<\fISUBNET\fR>
+
+.TP
+<\fIIP\fR>
+
+.TP
+[\fIWAN_ADDR\fR]
+