docs: publish bilingual manual standalone installation guides

scripts/check-standalone-prerequisites.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Check the host prerequisites for the manual standalone installation path.
+set -euo pipefail
+
+fail() {
+  echo "check-standalone-prerequisites.sh: $*" >&2
+  exit 1
+}
+
+require_command() {
+  command -v "$1" >/dev/null 2>&1 || fail "required command is missing: $1"
+}
+
+require_command git
+require_command docker
+require_command bash
+require_command curl
+require_command openssl
+require_command shasum
+
+docker info >/dev/null 2>&1 || fail "Docker Engine is not reachable; start Docker Desktop or the Docker service"
+
+compose_version=$(docker compose version --short 2>/dev/null) || {
+  fail "Docker Compose v2 is not available as 'docker compose'"
+}
+[[ -n "$compose_version" ]] || fail "Docker Compose returned no version"
+
+server_arch=$(docker version --format '{{.Server.Arch}}' 2>/dev/null) || {
+  fail "could not determine the Docker server architecture"
+}
+server_arch_lower=$(printf '%s' "$server_arch" | tr '[:upper:]' '[:lower:]')
+case "$server_arch_lower" in
+  amd64|x86_64|arm64|aarch64) ;;
+  *) fail "unsupported Docker server architecture: $server_arch (expected amd64 or arm64)" ;;
+esac
+
+printf 'Manual standalone prerequisites passed.\n'
+printf '  Docker Compose: %s\n' "$compose_version"
+printf '  Docker architecture: %s\n' "$server_arch"
+printf '  Host shell: %s\n' "$(uname -s)/$(uname -m)"
+
+if command -v tht >/dev/null 2>&1; then
+  printf '  tht: %s\n' "$(command -v tht)"
+else
+  printf '  tht: not installed yet (run bash scripts/install-tht.sh next)\n'
+fi