docs: rebrand documentation, packaging, and helper scripts to DragonX

The docs/packaging were largely un-rebranded Hush3 content, with several
docs stating facts that are wrong for DragonX. This rewrites them against
the verified DragonX source state.

Corrections (not just branding):
- PoW: RandomX (CPU), not Equihash/ASIC — README, overview.md, randomx.md
- Privacy: private from genesis (ac_private=1, Sapling@height1), not "as of
  block 340000" — overview.md, payment-api.md
- Removed the false "coinbase must be shielded" consensus claim
  (shield-coinbase.md, payment-api.md); coinbase is directly spendable
- Fixed default fee 0.0001 (was 0.0010000, 10x); stratum port 22769 (was 19031)
- datadir ~/.hush/DRAGONX, DRAGONX.conf, dragonxd/dragonx-cli/dragonx-tx,
  git.dragonx.is throughout; branch model dev->dragonx
- Softened the inherited dPoW reorg claim (no live DragonX notary infra)

Packaging: fix build-debian-package.sh + gen-manpages.sh to use the dragonx
binaries/manpages; rename bash-completions to dragonx*; drop hush-arrakis-chain
from the package. Keep /usr/share/hush (hardcoded in the binary for params).

Also: README links/logo, ObsidianDragon + SilentDragonXAndroid wallets,
networking/init/dev-process/contrib/util rebrand, and leftover helper scripts.
Delete legacy duplicates (hushd.* init/service, HUSH3.conf examples,
OLD_WALLETS.md, hsc.md) and rename hush-uri.bat -> dragonx-uri.bat.

Out of scope (noted, not changed): historical changelog/copyright, the Hush
mainnet airdrop snapshot, seed data files, depends/ source mirrors, and the
in-code strCurrencyUnits="HUSH".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

util/gen-manpages.sh

@@ -1,34 +1,35 @@
 #!/bin/sh
 # Copyright (c) 2016-2024 The Hush developers
+# Copyright (c) 2024-2026 The DragonX developers
 # Released under the GPLv3
 
 TOPDIR=${TOPDIR:-$(git rev-parse --show-toplevel)}
 SRCDIR=${SRCDIR:-$TOPDIR/src}
 MANDIR=${MANDIR:-$TOPDIR/doc/man}
 
-HUSHD=${HUSHD:-$SRCDIR/hushd}
-HUSHCLI=${HUSHCLI:-$SRCDIR/hush-cli}
-HUSHTX=${HUSHTX:-$SRCDIR/hush-tx}
+DRAGONXD=${DRAGONXD:-$SRCDIR/dragonxd}
+DRAGONXCLI=${DRAGONXCLI:-$SRCDIR/dragonx-cli}
+DRAGONXTX=${DRAGONXTX:-$SRCDIR/dragonx-tx}
 
-[ ! -x $HUSHD ] && echo "$HUSHD not found or not executable." && exit 1
+[ ! -x $DRAGONXD ] && echo "$DRAGONXD not found or not executable." && exit 1
 # Check if help2man is installed & if not then display error to user and exit
 [ ! -x "$(command -v help2man)" ] && echo "help2man could not be found" && echo "Please install from your Linux package manager and try again" && echo "On Debian-based systems you can do: apt-get install help2man" && exit 1
 
-# use this if hushd is not compiled
-#HUSHVER="v3.6.2"
-HUSHVER=$(./src/hushd --version|head -n1|cut -d' ' -f4|cut -d- -f1)
+# use this if dragonxd is not compiled
+#DRAGONXVER="v1.0.3"
+DRAGONXVER=$($DRAGONXD --version|head -n1|cut -d' ' -f4|cut -d- -f1)
 
 # Create a footer file with copyright content.
-# This gets autodetected fine for hushd if --version-string is not set,
-# but has different outcomes for hush-cli.
+# This gets autodetected fine for dragonxd if --version-string is not set,
+# but has different outcomes for dragonx-cli.
 echo "[COPYRIGHT]" > footer.h2m
-$HUSHD --version | sed -n '1!p' >> footer.h2m
+$DRAGONXD --version | sed -n '1!p' >> footer.h2m
 
-echo "Generating man pages for Hush $HUSHVER"
-for cmd in $HUSHD $HUSHCLI $HUSHTX; do
+echo "Generating man pages for DragonX $DRAGONXVER"
+for cmd in $DRAGONXD $DRAGONXCLI $DRAGONXTX; do
   cmdname="${cmd##*/}"
-  help2man -N --version-string=${HUSHVER} --include=footer.h2m -o ${MANDIR}/${cmdname}.1 ${cmd}
-  #sed -i "s/\\\-${HUSHVER[1]}//g" ${MANDIR}/${cmdname}.1
+  help2man -N --version-string=${DRAGONXVER} --include=footer.h2m -o ${MANDIR}/${cmdname}.1 ${cmd}
+  #sed -i "s/\\\-${DRAGONXVER[1]}//g" ${MANDIR}/${cmdname}.1
 done
 
 rm -f footer.h2m