Add one-line installer + install.sh, richer release notes

install.sh detects arch, downloads the latest binary and installs it to PATH
(like a `curl … | sh` installer). The release workflow now ships install.sh as
an asset and PATCHes the release body with the one-line install command, so the
release page shows how to install with a single command. README/wiki updated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011YPrEZVBpPVoCRyJz2exkZ

install.sh

@@ -0,0 +1,79 @@
+#!/bin/sh
+# npmctl-installerare — hämtar senaste binär och lägger den i PATH med ETT kommando:
+#
+#   curl -fsSL https://gitea.brasse-pc.eu/brasse/Npm-cli/raw/branch/main/install.sh | sh
+#
+# Miljövariabler:
+#   NPMCTL_INSTALL_DIR   installationskatalog (standard: /usr/local/bin, annars ~/.local/bin)
+#   NPMCTL_VERSION       release-tag att hämta (standard: latest)
+set -eu
+
+REPO="https://gitea.brasse-pc.eu/brasse/Npm-cli"
+VERSION="${NPMCTL_VERSION:-latest}"
+BIN="npmctl"
+
+info() { printf '\033[1;34m==>\033[0m %s\n' "$*"; }
+err()  { printf '\033[1;31mfel:\033[0m %s\n' "$*" >&2; exit 1; }
+
+# --- OS/arch ---
+[ "$(uname -s)" = "Linux" ] || err "endast Linux stöds (hittade $(uname -s))"
+case "$(uname -m)" in
+  x86_64|amd64)   ASSET="npmctl-linux-x64" ;;
+  aarch64|arm64)  ASSET="npmctl-linux-arm64" ;;
+  *) err "arkitektur stöds ej: $(uname -m)" ;;
+esac
+
+# --- verktyg ---
+if command -v curl >/dev/null 2>&1; then DL="curl -fsSL -o"; else
+  command -v wget >/dev/null 2>&1 || err "behöver curl eller wget"
+  DL="wget -qO"
+fi
+
+# --- installationskatalog ---
+DEST="${NPMCTL_INSTALL_DIR:-}"
+if [ -z "$DEST" ]; then
+  if [ "$(id -u)" -eq 0 ] || [ -w /usr/local/bin ]; then
+    DEST="/usr/local/bin"
+  else
+    DEST="$HOME/.local/bin"
+  fi
+fi
+mkdir -p "$DEST" 2>/dev/null || true
+
+URL="$REPO/releases/download/$VERSION/$ASSET"
+TMP="$(mktemp)"
+trap 'rm -f "$TMP"' EXIT
+
+info "Hämtar $ASSET ($VERSION) …"
+$DL "$TMP" "$URL" || err "nedladdning misslyckades: $URL"
+chmod +x "$TMP"
+
+# --- placera binären (med sudo vid behov) ---
+TARGET="$DEST/$BIN"
+if mv "$TMP" "$TARGET" 2>/dev/null; then
+  :
+elif command -v sudo >/dev/null 2>&1; then
+  info "Behöver rättigheter för $DEST — använder sudo"
+  sudo mv "$TMP" "$TARGET" && sudo chmod +x "$TARGET"
+else
+  err "kan inte skriva till $DEST (kör som root, använd sudo, eller sätt NPMCTL_INSTALL_DIR)"
+fi
+trap - EXIT
+
+info "Installerat: $TARGET"
+"$TARGET" --version || true
+
+case ":$PATH:" in
+  *":$DEST:"*) ;;
+  *) info "OBS: $DEST ligger inte i PATH. Lägg till: export PATH=\"$DEST:\$PATH\"" ;;
+esac
+
+cat <<EOF
+
+Kom igång:
+  $BIN --base-url http://127.0.0.1:81 login   # skriv lösenord en gång (cachas som token)
+  $BIN list-hosts
+  $BIN --help
+
+Guide: $REPO/wiki
+EOF